Question 1

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce an decrease in an independent-samples t-test
, how will the alternative hypothesis be stated?

Accepted Answer

The answer of If a researcher predicts the experimental treatment...

Question 2

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the $t_{o b t}$ is 0.29, which is not statistically significant.What is the most appropriate conclusion?

Accepted Answer

The answer of Suppose you measure the IQ of 14...

Question 3

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ $\bar{X}_{2}$ will produce an increase in an independent-samples t-test
, how will the null hypothesis be stated?

Accepted Answer

The answer of If a researcher predicts the experimental treatment...

Question 4

When $H_{0}$ is true, what does the mean of the sampling distribution of differences between means equal?

Accepted Answer

The answer of When $H_{0}$ is true, what does the...

Question 5

Suppose the average reading speed of 15 randomly selected elementary school students is 25, and the average reading speed of 15 randomly selected middle school students is 31.You compute an independent-samples t-test, and your $t_{o b t}$ is 5.72, which is statistically significant.What is the most appropriate conclusion?

Accepted Answer

The answer of Suppose the average reading speed of 15...

Question 6

A Cohen's d value of .5 would be viewed as indicative of a effect.
A)medium
B)small
C)large
D)very large

Accepted Answer

Cohen's d is a measure of effect size used in the context of statistical analysis. A value of .5 is generally considered to indicate a medium effect size according to conventional standards.

Question 7

In order to find the t-obtained for an independent t-test, which step is not required?
A)Set up the sampling distribution
B)Compute the pooled variance
C)Compute the standard error of the difference
D)Determine the means of your groups

Accepted Answer

Setting up the sampling distribution is not a step in calculating the t-obtained for an independent t-test. The calculation involves determining the means of the groups, computing the pooled variance, and computing the standard error of the difference between the means.

Question 8

If $S_{D}^{2}$ $\sum D$ = 20, N = 10, and = 4, what is $t_{o b t}$ when $H_{0}: \mu_{D}=0$ and $H_{a}: \mu_{D} \neq 0$ ?

Accepted Answer

The answer of If $S_{D}^{2}$ $\sum D$ = 20, N...

Question 9

State the null hypothesis for a two-tailed independent samples experiment.

Accepted Answer

The answer of State the null hypothesis for a two-tailed...

Question 10

What are the degrees of freedom for an independent-samples t-test using one sample with n = 13 and one sample with n = 15?

Accepted Answer

The answer of What are the degrees of freedom for...

Question 11

If a researcher predicts the experimental treatment will produce an increase in an independent-samples t-test $\bar{X}_{2}$ $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ , how will the alternative hypothesis be stated?

Accepted Answer

The answer of If a researcher predicts the experimental treatment...

Question 12

You have stated your alternative hypothesis as $S \bar{X}_{1}-\bar{X}_{2}$ $H_{a}: \mu_{1}-\mu_{2} \neq 0$ .If $\bar{X}_{1}$ = 23, $\bar{X}_{2}$ = 25, $n_{1}$ = 15, $n_{2}$ = 15, and
= 0.90, what is $t_{o b t}$ ?

Accepted Answer

The answer of You have stated your alternative hypothesis as...

Question 13

Suppose a researcher assessed attitudes towards a certain brand of soda before and after conducting a taste test and noted the following results: $\begin{array}{ll}
\text { Pre } & \text { Post } \
5 & 7 \
4 & 9 \
3 & 4 \
5 & 10 \
4 & 4 \
5 & 4
\end{array}$ What is the mean difference?
A)-2
B)-12
C)12
D)6

Accepted Answer

The answer of Suppose a researcher assessed attitudes towards a...

Question 14

If = 20, $\sum D$ $\sum D^{2}$ = 220, and N = 10, what is $S \bar{D}$ ?

Accepted Answer

The answer of If = 20, $\sum D$ $\sum D^{2}$...

Question 15

Suppose a researcher compares 50 pairs of husbands and wives on a variety of attitudes.In doing so, the researcher is making use of _________________ samples with a ______________________ design.
A)related; matched-samples
B)related; repeated measures
C)independent; matched-samples
D)independent; repeated measures

Accepted Answer

The researcher is using related samples because the pairs of husbands and wives are inherently related to each other. The design is matched-samples because each husband is matched with his wife, making the samples related but distinct within each pair.

Question 16

An appropriate example of a repeated measures design would be
A)comparing individual attitudes about drinking before and after viewing a film on the topic.
B)contrasting how the personalities of identical twins may differ.
C)ascertaining whether a given sample is a good representative of a given population.
D)comparing how men and women differ on memory tasks.

Accepted Answer

A repeated measures design involves measuring the same subjects under different conditions or at different times. Option A is an example of this, as it involves comparing the same individuals' attitudes before and after they view a film.

Question 17

Suppose you tested two age groups on the number of details they could recall from a paragraph.The mean for the older group is 16, and the mean for the younger group is 14.Further suppose you fail to reject the null hypothesis for this independent-samples t-test.What best accounts for the difference between these sample means?

Accepted Answer

The answer of Suppose you tested two age groups on...

Question 18

What are the degrees of freedom for an independent-samples t-test using two samples with n = 20 in each sample?

Accepted Answer

The answer of What are the degrees of freedom for...

Question 19

How many subjects participated in an independent-samples t-test if a researcher reports t20) = 3.68?

Accepted Answer

The answer of How many subjects participated in an independent-samples...

Question 20

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce a decrease in an independent-samples t-test
, how will the null hypothesis be stated?

Accepted Answer

The answer of If a researcher predicts the experimental treatment...

Quiz 9: Hypothesis Testing Using the Two-Sample T-Test

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce an decrease in an independent-samples t-test , how will the alternative hypothesis be stated?

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the $t_{o b t}$ is 0.29, which is not statistically significant.What is the most appropriate conclusion?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ $\bar{X}_{2}$ will produce an increase in an independent-samples t-test , how will the null hypothesis be stated?

When $H_{0}$ is true, what does the mean of the sampling distribution of differences between means equal?

A Cohen's d value of .5 would be viewed as indicative of a effect.

In order to find the t-obtained for an independent t-test, which step is not required?

If $S_{D}^{2}$ $\sum D$ = 20, N = 10, and = 4, what is $t_{o b t}$ when $H_{0}: \mu_{D}=0$ and $H_{a}: \mu_{D} \neq 0$ ?

State the null hypothesis for a two-tailed independent samples experiment.

What are the degrees of freedom for an independent-samples t-test using one sample with n = 13 and one sample with n = 15?

If a researcher predicts the experimental treatment will produce an increase in an independent-samples t-test $\bar{X}_{2}$ $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ , how will the alternative hypothesis be stated?

You have stated your alternative hypothesis as $S \bar{X}_{1}-\bar{X}_{2}$ $H_{a}: \mu_{1}-\mu_{2} \neq 0$ .If $\bar{X}_{1}$ = 23, $\bar{X}_{2}$ = 25, $n_{1}$ = 15, $n_{2}$ = 15, and = 0.90, what is $t_{o b t}$ ?

Suppose a researcher assessed attitudes towards a certain brand of soda before and after conducting a taste test and noted the following results: $\begin{array}{ll}\text { Pre } & \text { Post } \\5 & 7 \\4 & 9 \\3 & 4 \\5 & 10 \\4 & 4 \\5 & 4\end{array}$ What is the mean difference?

If = 20, $\sum D$ $\sum D^{2}$ = 220, and N = 10, what is $S \bar{D}$ ?

Suppose a researcher compares 50 pairs of husbands and wives on a variety of attitudes.In doing so, the researcher is making use of _ samples with a ______ design.

An appropriate example of a repeated measures design would be

What are the degrees of freedom for an independent-samples t-test using two samples with n = 20 in each sample?

How many subjects participated in an independent-samples t-test if a researcher reports t20) = 3.68?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce a decrease in an independent-samples t-test , how will the null hypothesis be stated?

Quiz 9: Hypothesis Testing Using the Two-Sample T-Test

If a researcher predicts the experimental treatment (Xˉ1−Xˉ2>0)\left(\bar{X}_{1}-\bar{X}_{2}>0\right)(Xˉ1​−Xˉ2​>0) Xˉ2\bar{X}_{2}Xˉ2​ will produce an decrease in an independent-samples t-test , how will the alternative hypothesis be stated?

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the tobtt_{o b t}tobt​ is 0.29, which is not statistically significant.What is the most appropriate conclusion?

If a researcher predicts the experimental treatment (Xˉ1−Xˉ2<0)\left(\bar{X}_{1}-\bar{X}_{2}<0\right)(Xˉ1​−Xˉ2​<0) Xˉ2\bar{X}_{2}Xˉ2​ will produce an increase in an independent-samples t-test , how will the null hypothesis be stated?

When H0H_{0}H0​ is true, what does the mean of the sampling distribution of differences between means equal?

A Cohen's d value of .5 would be viewed as indicative of a effect.

In order to find the t-obtained for an independent t-test, which step is not required?

If SD2S_{D}^{2}SD2​ ∑D\sum D∑D = 20, N = 10, and = 4, what is tobtt_{o b t}tobt​ when H0:μD=0H_{0}: \mu_{D}=0H0​:μD​=0 and Ha:μD≠0H_{a}: \mu_{D} \neq 0Ha​:μD​=0 ?

State the null hypothesis for a two-tailed independent samples experiment.

What are the degrees of freedom for an independent-samples t-test using one sample with n = 13 and one sample with n = 15?

If a researcher predicts the experimental treatment will produce an increase in an independent-samples t-test Xˉ2\bar{X}_{2}Xˉ2​ (Xˉ1−Xˉ2<0)\left(\bar{X}_{1}-\bar{X}_{2}<0\right)(Xˉ1​−Xˉ2​<0) , how will the alternative hypothesis be stated?

If = 20, ∑D\sum D∑D ∑D2\sum D^{2}∑D2 = 220, and N = 10, what is SDˉS \bar{D}SDˉ ?

Suppose a researcher compares 50 pairs of husbands and wives on a variety of attitudes.In doing so, the researcher is making use of _________________ samples with a ______________________ design.

An appropriate example of a repeated measures design would be

What are the degrees of freedom for an independent-samples t-test using two samples with n = 20 in each sample?

How many subjects participated in an independent-samples t-test if a researcher reports t20) = 3.68?

If a researcher predicts the experimental treatment (Xˉ1−Xˉ2>0)\left(\bar{X}_{1}-\bar{X}_{2}>0\right)(Xˉ1​−Xˉ2​>0) Xˉ2\bar{X}_{2}Xˉ2​ will produce a decrease in an independent-samples t-test , how will the null hypothesis be stated?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce an decrease in an independent-samples t-test , how will the alternative hypothesis be stated?

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the $t_{o b t}$ is 0.29, which is not statistically significant.What is the most appropriate conclusion?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ $\bar{X}_{2}$ will produce an increase in an independent-samples t-test , how will the null hypothesis be stated?

When $H_{0}$ is true, what does the mean of the sampling distribution of differences between means equal?

If $S_{D}^{2}$ $\sum D$ = 20, N = 10, and = 4, what is $t_{o b t}$ when $H_{0}: \mu_{D}=0$ and $H_{a}: \mu_{D} \neq 0$ ?

If a researcher predicts the experimental treatment will produce an increase in an independent-samples t-test $\bar{X}_{2}$ $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ , how will the alternative hypothesis be stated?

If = 20, $\sum D$ $\sum D^{2}$ = 220, and N = 10, what is $S \bar{D}$ ?

Suppose a researcher compares 50 pairs of husbands and wives on a variety of attitudes.In doing so, the researcher is making use of _ samples with a ______ design.

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce a decrease in an independent-samples t-test , how will the null hypothesis be stated?