Deck 10: Only the Lonely

Question 1

Excel can apply the Z tests to data arranged in rows or in columns, but the statistical packages present the results typically by.

A) Rows
B) Columns

Answer 1

B

Question 2

Excel differentiates z-scores and z-values by identifying one sample test by using what function?

A) FTEST
B) CHITEST
C) TTEST
D) ZTEST

Answer 2

D

Question 3

A good reason to use a one sample Z-test is to know if the sample values are different from a given?

A) sample
B) value
C) collection
D) population

Answer 3

D

Question 4

In Excel, what are the three components of the ZTEST function?

A)
B) Array, Xbar, sigma
C) Array, n, sigma
D) Array, SEM, sigma

Question 5

What Greek letter represents the population average in a Z Test equation?

Question 6

When you reject the null hypothesis when it is really true, then you have made a?

A) Incorrect decision
B) Correct decision
C) Type II error
D) Type I error

Question 7

Because these compare between two means to suggest whether both samples come from the same population the Z Test is similar to.

A) ANOVA
B) Chi-Test
C) F-Tests
D) T- Tests

Question 8

The observed sample mean?

A) Array
B) Mean score
C) Sigma
D) Mu

Question 9

The Array is also known as the?

A) Sigma
B) Mean score
C) AVERAGE
D) Mu

Question 10

The symbol in the Z Test equation is defined as?

A) The range of data
B) The standard error
C) The mean of the sample
D) The standard deviation

Question 11

The formula to compute the standard error of the mean requires the standard deviation for the population divided by the square root of?

A) The population average
B) The mean of the sample
C) The size of the sample
D) The standard deviation

Question 12

Given that it is impossible to compute all the possible means, what is the best estimate that can be used?

A) ANOVA
B) SEM
C) Xbar
D) T Test

Question 13

Given the symmetry of the normal distribution, if AVERAGE(array) < ??, then the ZTEST will return a value greater than?

A) 0.10
B) .001
C) 0.5
D) 0.05

Question 14

A Z Test is preferred when the population (n) is?

A) >30
B) <30
C) =30
D) 30

Question 15

Degrees of freedom for the Z Test are not required given that z-scores of 1.96 and 2.58 are used for 5% and 1% respectively.

Question 16

Using the standard error of the mean allows the researchers to use the table of z scores to:

A) Reach a decision as to the probability of an outcome
B) Determine the mean of the population
C) Determine the value of the scores is by chance
D) Reach a decision as to the probability of the z value

Question 17

If z represents the test statistic used which results in z=2.05, p<.05 what does this result indicate?

A) That 2.05 is the critical value
B) That 2.05 is not the critical value
C) The probability is less than 5% that on any one test of the null hypothesis, the sample and the population averages differ
D) The probability is less than 5% that on any one test of the null hypothesis, the sample and the population averages agree

Question 18

If the obtained z value is more extreme than the critical value, then?

A) The hypothesis is non-directional
B) The null hypothesis can be accepted
C) The null hypothesis cannot be accepted
D) The hypothesis is directional

Question 19

The primary purpose of a Z TEST is?

A) To provide sample values
B) To return the one-tailed probability value
C) To return a significance level
D) To return a chance level

Question 20

When you reject the null hypothesis when it is really false, then you have made a?

A) Type I error
B) Incorrect decision
C) Type II error
D) Correct decision

Question 21

If you have designed a 99% confidence interval to estimate the population average (?) with a known standard deviation for the populationstandard deviation for the populationstandard deviation for the population (?), what is supposed to be the correct critical values range for z?

Question 22

A test is conducted for H?: ? = 34, with ? = 5. A sample size of 100 is selected. Calculate the standard error of the sampling distribution.

Question 23

A test is conducted for H?: ? = 20, with ? = 4. A sample of size 36 has = 21.4. Calculate the Z Test.

Question 24

What can be said about data points and Z Tests?

Question 25

You have a sample of 45 male teens ages 15-19 have with a mean height of 70.8 inches and assume you have a ? = 1.5 inches. What is the equation that will determine the standard error of the mean?

Question 26

If n > 30, what should the distribution be?

Question 27

Write the formula used for computing the value for a one sample Z-Z-test and define each of the three components.

Question 28

If the n is less than 30, what should the distribution be?

Question 29

If you have a sample of size 60 and a sample mean of 8.3 was selected from a population where ? = 1.2 (the standard deviation for the population), determine the interval for the population average (?) at the 95% confidence interval.

Question 30

When analyzing data types what type of chance should each individual have for being selected?