Question 1

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.If Dr.Hinson fails to implement the appropriate changes to his experiment a potential confound may be_____.
A)order effects
B)disturbance variance
C)ceiling effect
D)Both a & b

Accepted Answer

A

Question 2

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
What is the nature of the relationship in Dr.Augusts' research?
A)when women received praise they had more job satisfaction
B)when women received a gift card they had more job satisfaction
C)she has a type II error so the results are not conclusive
D)the independent variable had no affect on job satisfaction
E)both c & d

Accepted Answer

A

Question 3

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
What is the strength of the relationship of the data above?
A).90
B).80
C).88
D).76

Accepted Answer

A

Question 4

A correlated groups t-test is used when_____.
A)the independent variable is between subjects
B)the independent variable is within subjects
C)when subjects are matched on a particular variable
D)Both b & c
E)all of these

Accepted Answer

A correlated groups t-test is used when the independent variable is within subjects or when subjects are matched on a particular variable, making both B and C correct.

Question 5

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.In Dr.Hinson's study if he is using a total of 30 rats what is his degrees of freedom?
A)28
B)30
C)29
D)27

Accepted Answer

The degrees of freedom for this experiment would be 29, as it is calculated by subtracting the number of groups being compared from the total sample size (df = n - 1). In this case, Dr. Hinson is comparing two groups (rats on enriched diet vs. rats on normal diet), so the degrees of freedom would be 29 (30-1-1 = 29). Therefore, the correct choice is C.

Question 6

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
What statistical test should be used to analyze Dr.Augusts' data?
A)correlated-groups t test
B)independent-groups t test
C)two-sample independent z test
D)Pearson correlation

Accepted Answer

The appropriate statistical test for this study would be correlated-groups t test, also known as paired-samples t test, as the same group of women receive both treatments (praise and gift card) and their scores on job satisfaction are compared within the same group. This test will allow Dr. August to determine if there is a significant difference in job satisfaction scores between the two treatment conditions.

Question 7

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.What type of statistical test should Dr.Hinson use in analyze his data?
A)one-sample z test
B)independent-groups t test
C)correlated-groups t test
D)Pearson correlation

Accepted Answer

In this experiment, Dr. Hinson wants to compare the maze learning performance of the same group of rats when fed two different diets (normal and enriched with omega). Therefore, this is a repeated measures design (or within-subjects design), and the same participants (i.e., rats) are exposed to both the control and experimental conditions. The correlated-groups t test is the appropriate statistical test to analyze the differences in maze learning performance between the two diets because it compares the means of two related (or correlated) groups of scores (i.e., the same rats tested in two different conditions). This test takes into account individual differences between the rats and increases the statistical power of the analysis.

Question 8

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
What should be done after the inference about the relationship has been determined?
A)eta-squared should be calculated
B)confidence intervals should be determined
C)a methods section should be written
D)None of these

Accepted Answer

The answer of Dr.August is investigating whether or not women...

Question 9

A correlated groups t-test is a parametric test and assumes_____.
A)the population is normally distributed
B)the population is normally skewed
C)the independent variable is measured on an ordinal scale
D)All of these
E)both a & c

Accepted Answer

A correlated groups t-test is a parametric test that assumes the population is normally distributed.

Question 10

The 95% confidence interval for the mean differences is reported following _____.
A)one-sample z test
B)independent-groups t test
C)correlated-groups t test
D)Pearson correlation
E)both b & c

Accepted Answer

The answer of The 95% confidence interval for the mean...

Question 11

Dr.Miguel is studying stages of verbal ability in kids.He test the kids on verbal ability at age 5 years then again at age of 7.What type of statistical test should he use to analyze his data?
A)one-sample z test
B)independent-groups t test
C)correlated-groups t test
D)Pearson correlation

Accepted Answer

The study involves testing the same group of children at two different time points, hence the appropriate statistical test would be the correlated-groups t test. This test is used to analyze the differences between two related groups.

Question 12

The main difference between a correlated groups t-test and Independent groups t-test include(s)_____.
A)an independent groups t-test assumes the distribution is normal
B)the correlated groups t-test assumes the independent variable is within subjects
C)the correlated groups t-test assumes the population mean is known
D)the independent groups t-test assumes the population means is known
E)none of these

Accepted Answer

The main difference between a correlated groups t-test and Independent groups t-test is that the correlated groups t-test assumes that the independent variable is within subjects, while the independent groups t-test assumes that the groups are independent of each other. The assumption about normal distribution and population mean knowledge is applicable to both types of t-tests.

Question 13

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
Should the confidence intervals be included in the results section?
A)Yes,they should be included
B)no,this only pertains to independent groups t-test
C)Yes,but only if the results are not statistically significant
D)Both a & c

Accepted Answer

Confidence intervals should be included in the results section to provide information about the precision and variability of the estimates. This is important regardless of whether the results are statistically significant or not.

Question 14

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. Which of the following statements best describes results of Dr.Augusts' alternative hypothesis? A)µ₁=µ₂ B)µ₁?µ₂ C)µ=0 D)µ₁>0

Accepted Answer

Choice B represents a hypothesis test where the null hypothesis states that there is no difference in job satisfaction between receiving praise and receiving a gift card, and the alternative hypothesis states that there is a difference. The symbols represent the mean job satisfaction for each condition (S1=praise, U1=gift card, B1=before, B2=after). The question mark (?) indicates that the direction of the difference is not specified, but it could be determined from the direction of the test statistic and the associated p-value. Therefore, choice B is the best option as it reflects the hypothesis test that Dr. August would have conducted, and it aligns with the data provided.

Question 15

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
What is the calculated t-value for Dr.Augusts' data above?
A)5.70
B)6.00
C)5.88
D)1.90

Accepted Answer

The t-value is calculated to be 6.00. This indicates a significant difference between the job satisfaction scores after receiving praise compared to after receiving a gift card.

Question 16

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
After calculating the t-value can you reject the null hypothesis? (Note she used a nondirectional test with the alpha level set at 0.05 so the table t was 2.776).
A)No,there was no affect of the independent variable
B)Yes,there was an affect of the independent variable
C)She needs to change her hypothesis
D)none of these

Accepted Answer

The answer of Dr.August is investigating whether or not women...

Question 17

Jake is working on his thesis and has two groups of subjects.A total of 10 subjects listened to music at 80 decibels which is considered loud.While the other 10 subjects listed to the same music at only 30 decibels which is soft.After 1 hour each groups was given a hearing test.However,he matched subjects before they were put into groups on hearing abilities.What statistical test should be used to analyze the data?
A)correlated-groups t test
B)independent-groups t test
C)two-sample independent z test
D)Pearson correlation

Accepted Answer

The answer of Jake is working on his thesis and...

Question 18

Within subjects designs have several advantages which include_____.
A)a smaller sample size is needed
B)a larger sample size is needed
C)less disturbance variables
D)Both a & c
E)none of these

Accepted Answer

Within subjects designs have the advantage of controlling for individual differences and reducing the variability of data, which leads to the need for smaller sample sizes. Additionally, because the same participants are used for all conditions, there are fewer extraneous variables that may impact the results, leading to less disturbance variables.

Question 19

Dr.August is investigating whether or not women have more job satisfaction after they are given praise or a gift card (different levels or rewards).She has recruited 10 women from Intel and for 6 months the women received praise then the next 6 months they received a gift card.The conditions were counterbalanced and a survey on job satisfaction was distributed following the treatment conditions or every 6 months until the research was completed.After finishing her study Dr.August was busy writing a grant,therefore she has asked you to analyze her data below.Please note the survey was based on 1-5 Likert scale with high scores indicating high job satisfaction and low score indicating dissatisfaction. 
In Dr.Augusts' result section how should she report the results of the t-test you calculated for her?
A)t(9)= 1.90,p<0.05
B)t(4)= 6.00 p<0.05
C)t(5)= 5.88 p<0.05
D)None of these

Accepted Answer

The answer of Dr.August is investigating whether or not women...

Question 20

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.What should Dr.Hinson do before he starts his experiment?
A)counterbalance the diet so 15 rats receive omega then normal chow and 15 normal chow then omega diet
B)raise them on the appropriate omega diet before starting his experiment
C)measuring the speed of each rat can run before implementing the independent variable
D)All of these

Accepted Answer

Dr. Hinson should counterbalance the diet to control for order effects, ensuring that any differences in maze performance are due to the diet and not the order in which the diets are given.

Quiz 11: Correlated Groups T-Test

A correlated groups t-test is used when_____.

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.In Dr.Hinson's study if he is using a total of 30 rats what is his degrees of freedom?

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.What type of statistical test should Dr.Hinson use in analyze his data?

A correlated groups t-test is a parametric test and assumes_____.

The 95% confidence interval for the mean differences is reported following _____.

Dr.Miguel is studying stages of verbal ability in kids.He test the kids on verbal ability at age 5 years then again at age of 7.What type of statistical test should he use to analyze his data?

The main difference between a correlated groups t-test and Independent groups t-test include(s) _____.

Within subjects designs have several advantages which include_____.

Dr.Hinson wants to investigate if rats fed a diet enriched with omega will do better at a maze learning task then when these same rats are given a normal diet.He has a total of 30 rats for his experiment.What should Dr.Hinson do before he starts his experiment?