Question 1

A ______ can represent the variability of ______.

Accepted Answer

A)  standard deviation; sample means   
B)  standard deviation; differences between two sample means 
C)  standard error; individual scores (X) 
D)  standard error; sample means   
A)  standard deviation; sample means   
B)  standard deviation; differences between two sample means 
C)  standard error; individual scores (X) 
D)  standard error; sample means

Question 2

Although their formulas are similar, one primary difference between a z-score (z) and a t-statistic (t) is that the ______ of the formula for the t-statistic involves ______.

Accepted Answer

A)  denominator; the variability of individual scores (Xs), not the variability of sample means   
B)  numerator; difference between a score (X) and a population mean (μ) 
C)  denominator; the variability of sample means   , not the variability of individual scores (Xs) 
D)  numerator; the difference between a score (X) and a sample mean   
A)  denominator; the variability of individual scores (Xs), not the variability of sample means   
B)  numerator; difference between a score (X) and a population mean (μ) 
C)  denominator; the variability of sample means   , not the variability of individual scores (Xs) 
D)  numerator; the difference between a score (X) and a sample mean

Question 3

Answering the question, "Is p < .01?" is part of ______.

Accepted Answer

A)  making the decision to reject the null hypothesis 
B)  calculating the degrees of freedom 
C)  determining the level of significance 
D)  setting α 
A)  making the decision to reject the null hypothesis 
B)  calculating the degrees of freedom 
C)  determining the level of significance 
D)  setting α

Question 4

Imagine the value of a t-statistic is greater than the critical value for α = .05 but less than the critical value for α = .01. Which of the following is the level of significance for this t-statistic?

Accepted Answer

A) p .01 C) p > .01 (but not < .05) D) p < .05 (but not < .01) A) p .01 C) p > .01 (but not < .05) D) p < .05 (but not < .01)

Question 5

This distribution provides an illustration of a ______.

Accepted Answer

A)  one-tailed null hypothesis 
B)  directional null hypothesis 
C)  directional alternative hypothesis 
D)  two-tailed alternative hypothesis 
A)  one-tailed null hypothesis 
B)  directional null hypothesis 
C)  directional alternative hypothesis 
D)  two-tailed alternative hypothesis

Question 6

A researcher tests the mean of a sample of 25 people and calculates a value of 2.51 for the t-statistic. For α = .05 (two-tailed), which of the following is most appropriate?

Accepted Answer

A)  do not reject null (p  .05) 
C)  reject null (p  .01) 
A)  do not reject null (p  .05) 
C)  reject null (p  .01)

Question 7

A z-statistic of 1.35 is significant at the .05 alpha level for a two-tailed test.

Accepted Answer

A) True 
 B)False

Question 8

A researcher calculates a mean from a sample of 19 people. For α = .05, if the researcher states the hypotheses as H0: µ = 200 and H1: µ < 200, which of the following is an appropriate critical value?

Accepted Answer

A)  0.688 
B)  1.645 
C)  1.734 
D)  1.729 
A)  0.688 
B)  1.645 
C)  1.734 
D)  1.729

Question 9

The ______ is the distribution of values of the sample mean for an infinite number of samples of size N that are randomly selected from the population.

Accepted Answer

A)  sampling distribution 
B)  standard error of the mean 
C)  sampling distribution of the mean 
D)  population standard error of the mean 
A)  sampling distribution 
B)  standard error of the mean 
C)  sampling distribution of the mean 
D)  population standard error of the mean

Question 10

Using the following information, calculate the z-statistic for the z-test for one mean.   = 15 μ = 22   = 3.50

Accepted Answer

A)  2.00 
B)  -2.00 
C)  1.23 
D)  -3.13 
A)  2.00 
B)  -2.00 
C)  1.23 
D)  -3.13

Question 11

A researcher conducted an analysis that supported the research hypothesis that SJSU students spend less on textbooks than the average California college student. As a result of this finding, imagine you hypothesize that SJSU freshmen owe less on their credit cards than the average college freshman. To test this hypothesis, a group of college students are asked, "If you have your own credit card(s), how much do you currently owe on them?" The responses of some of the students in this class are summarized as: N = 25   = 834.53
S = 169.40
According to a recent study, the average college freshman owes $900 on their credit cards (Arano, 2006). Therefore, in this analysis, how could the null and alternative hypotheses be stated?

Accepted Answer

A)  H0: μ > 900; H1: μ 0: μ ≠ 900; H1: μ = 900 
C)  H0: μ = 900; H1: μ ≠ 900 
D)  H0: μ = 834.53; H1: μ ≠ 834.53 
A)  H0: μ > 900; H1: μ 0: μ ≠ 900; H1: μ = 900 
C)  H0: μ = 900; H1: μ ≠ 900 
D)  H0: μ = 834.53; H1: μ ≠ 834.53

Question 12

If I wanted to measure the variability in a set of scores (Xs), I would calculate ______.

Accepted Answer

A)  the standard error of the mean   
B)  the standard deviation (s) 
C)  z-scores 
D)  the t-statistic 
A)  the standard error of the mean   
B)  the standard deviation (s) 
C)  z-scores 
D)  the t-statistic

Question 13

Using the following information, calculate the z-statistic for the z-test for one mean.   = 154 μ = 145   = 15.25

Accepted Answer

A)  9.00 
B)  -9.00 
C)  .59 
D)  -.59 
A)  9.00 
B)  -9.00 
C)  .59 
D)  -.59

Question 14

A researcher calculates a mean from a sample of 23 people. In analyzing her data, she states the following hypotheses: H0: μ = 25 and H1: μ ≠ 25. For α = .05, which is an appropriate critical value?

Accepted Answer

A)  1.717 
B)  2.074 
C)  2.069 
D)  2.064 
A)  1.717 
B)  2.074 
C)  2.069 
D)  2.064

Question 15

A study based on a sample of 20 participants calculates a value of 1.92 for the t-test for a single mean. For alpha (α) = .05 (two-tailed), which of the following is the correct way to present this analysis?

Accepted Answer

A) t(18) = 1.92, p > .01 B) t(19) = 1.92, p .05 D) t(19) = 1.92, p < .01 A) t(18) = 1.92, p > .01 B) t(19) = 1.92, p .05 D) t(19) = 1.92, p < .01

Question 16

If the value of a calculated z-statistic ______ the critical value, you would say ______.

Accepted Answer

A) exceeds; p > .05 B) exceeds; p < .05 C) does not exceed; p < .05 D) does not exceed; p < .01 A) exceeds; p > .05 B) exceeds; p < .05 C) does not exceed; p < .05 D) does not exceed; p < .01

Question 17

The '>' symbol would appear in the ______ hypothesis and would imply that this hypothesis is ______.

Accepted Answer

A)  null; non-directional 
B)  null; two-tailed 
C)  alternative; one-tailed 
D)  alternative; non-directional 
A)  null; non-directional 
B)  null; two-tailed 
C)  alternative; one-tailed 
D)  alternative; non-directional

Question 18

A researcher calculates a mean from a sample of 10 people. In analyzing her data, she states the following hypotheses: H0: μ = 30 and H1: μ ≠ 30. If α = .05, which of the following is an appropriate critical value?

Accepted Answer

A)  1.833 
B)  2.042 
C)  2.228 
D)  2.262 
A)  1.833 
B)  2.042 
C)  2.228 
D)  2.262

Question 19

The mean of the sampling distribution of the mean is equal to ______.

Accepted Answer

A)    
B)  1 
C)  0 
D)  µ 
A)    
B)  1 
C)  0 
D)  µ

Question 20

A population has a mean of 55.25 and a standard deviation of 14.23. For a sample of N = 100, what is the population standard error of the mean   ?

Accepted Answer

A)  7.03 
B)  3.77 
C)  1.43 
D)  1.42 
A)  7.03 
B)  3.77 
C)  1.43 
D)  1.42

A can represent the variability of .

Although their formulas are similar, one primary difference between a z-score (z) and a t-statistic (t) is that the of the formula for the t-statistic involves .

Answering the question, "Is p < .01?" is part of ______.

Imagine the value of a t-statistic is greater than the critical value for α = .05 but less than the critical value for α = .01. Which of the following is the level of significance for this t-statistic?

This distribution provides an illustration of a ______.

A researcher tests the mean of a sample of 25 people and calculates a value of 2.51 for the t-statistic. For α = .05 (two-tailed), which of the following is most appropriate?

A z-statistic of 1.35 is significant at the .05 alpha level for a two-tailed test.

A researcher calculates a mean from a sample of 19 people. For α = .05, if the researcher states the hypotheses as H₀: µ = 200 and H₁: µ < 200, which of the following is an appropriate critical value?

The ______ is the distribution of values of the sample mean for an infinite number of samples of size N that are randomly selected from the population.

Using the following information, calculate the z-statistic for the z-test for one mean. = 15 μ = 22 = 3.50

If I wanted to measure the variability in a set of scores (Xs), I would calculate ______.

Using the following information, calculate the z-statistic for the z-test for one mean. = 154 μ = 145 = 15.25

A researcher calculates a mean from a sample of 23 people. In analyzing her data, she states the following hypotheses: H₀: μ = 25 and H₁: μ ≠ 25. For α = .05, which is an appropriate critical value?

A study based on a sample of 20 participants calculates a value of 1.92 for the t-test for a single mean. For alpha (α) = .05 (two-tailed), which of the following is the correct way to present this analysis?

If the value of a calculated z-statistic the critical value, you would say .

The '>' symbol would appear in the hypothesis and would imply that this hypothesis is .

A researcher calculates a mean from a sample of 10 people. In analyzing her data, she states the following hypotheses: H₀: μ = 30 and H₁: μ ≠ 30. If α = .05, which of the following is an appropriate critical value?

The mean of the sampling distribution of the mean is equal to ______.

A population has a mean of 55.25 and a standard deviation of 14.23. For a sample of N = 100, what is the population standard error of the mean ?

Introduction to Statistics

Examining Data: Tables and Figures

Measures of Central Tendency

Measures of Variability

Normal Distributions

Probability and Hypothesis Testing

Estimating the Mean of a Population

Testing the Difference Between Two Means

Errors in Hypothesis Testing, Statistical Power, and Effect Size

One-Way Analysis of Variance Anova

Two-Way Analysis of Variance Anova

Correlation

Linear Regression and Multiple Correlation

Chi-Square

Filters

Exam 7: Testing One Sample Mean

A ______ can represent the variability of ______.

Although their formulas are similar, one primary difference between a z-score (z) and a t-statistic (t) is that the ______ of the formula for the t-statistic involves ______.

Answering the question, "Is p < .01?" is part of ______.

Imagine the value of a t-statistic is greater than the critical value for α = .05 but less than the critical value for α = .01. Which of the following is the level of significance for this t-statistic?

This distribution provides an illustration of a ______.

A researcher tests the mean of a sample of 25 people and calculates a value of 2.51 for the t-statistic. For α = .05 (two-tailed), which of the following is most appropriate?

A z-statistic of 1.35 is significant at the .05 alpha level for a two-tailed test.

A researcher calculates a mean from a sample of 19 people. For α = .05, if the researcher states the hypotheses as H0: µ = 200 and H1: µ < 200, which of the following is an appropriate critical value?

The ______ is the distribution of values of the sample mean for an infinite number of samples of size N that are randomly selected from the population.

Using the following information, calculate the z-statistic for the z-test for one mean. = 15 μ = 22 = 3.50

If I wanted to measure the variability in a set of scores (Xs), I would calculate ______.

Using the following information, calculate the z-statistic for the z-test for one mean. = 154 μ = 145 = 15.25

A researcher calculates a mean from a sample of 23 people. In analyzing her data, she states the following hypotheses: H0: μ = 25 and H1: μ ≠ 25. For α = .05, which is an appropriate critical value?

A study based on a sample of 20 participants calculates a value of 1.92 for the t-test for a single mean. For alpha (α) = .05 (two-tailed), which of the following is the correct way to present this analysis?

If the value of a calculated z-statistic ______ the critical value, you would say ______.

The '>' symbol would appear in the ______ hypothesis and would imply that this hypothesis is ______.

A researcher calculates a mean from a sample of 10 people. In analyzing her data, she states the following hypotheses: H0: μ = 30 and H1: μ ≠ 30. If α = .05, which of the following is an appropriate critical value?

The mean of the sampling distribution of the mean is equal to ______.

A population has a mean of 55.25 and a standard deviation of 14.23. For a sample of N = 100, what is the population standard error of the mean ?

Introduction to Statistics

Examining Data: Tables and Figures

Measures of Central Tendency

Measures of Variability

Normal Distributions

Probability and Hypothesis Testing

Estimating the Mean of a Population

Testing the Difference Between Two Means

Errors in Hypothesis Testing, Statistical Power, and Effect Size

One-Way Analysis of Variance Anova

Two-Way Analysis of Variance Anova

Correlation

Linear Regression and Multiple Correlation

Chi-Square

Filters

A can represent the variability of .

Although their formulas are similar, one primary difference between a z-score (z) and a t-statistic (t) is that the of the formula for the t-statistic involves .

A researcher calculates a mean from a sample of 19 people. For α = .05, if the researcher states the hypotheses as H₀: µ = 200 and H₁: µ < 200, which of the following is an appropriate critical value?

A researcher calculates a mean from a sample of 23 people. In analyzing her data, she states the following hypotheses: H₀: μ = 25 and H₁: μ ≠ 25. For α = .05, which is an appropriate critical value?

If the value of a calculated z-statistic the critical value, you would say .

The '>' symbol would appear in the hypothesis and would imply that this hypothesis is .

A researcher calculates a mean from a sample of 10 people. In analyzing her data, she states the following hypotheses: H₀: μ = 30 and H₁: μ ≠ 30. If α = .05, which of the following is an appropriate critical value?