Question 1

For a z-statistic of 2.22, one would conclude (for a two-tailed test) the score is ______.

Accepted Answer

A)  significant at the .05 level but not the .01 level 
B)  significant at both the .05 level and the .01 level 
C)  not significant 
D)  not significant at the .05 level but is significant at the .01 level 
A)  significant at the .05 level but not the .01 level 
B)  significant at both the .05 level and the .01 level 
C)  not significant 
D)  not significant at the .05 level but is significant at the .01 level

Question 2

A ______ is used to evaluate ______.

Accepted Answer

A)  z-score; the mean of a sample 
B)  t-test; the difference between two means 
C)  z-score; the difference between a sample mean and a population mean 
D)  t-test; a score on a variable 
A)  z-score; the mean of a sample 
B)  t-test; the difference between two means 
C)  z-score; the difference between a sample mean and a population mean 
D)  t-test; a score on a variable

Question 3

A study based on a sample of 17 participants calculates a value of 2.33 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(16) = 2.33, p  .05 
C)  t(17) = 2.33, p  .01 
A)  t(16) = 2.33, p  .05 
C)  t(17) = 2.33, p  .01

Question 4

Holding all else constant, as sample size increases, the sampling distribution of the mean ______.

Accepted Answer

A)  becomes flatter 
B)  has greater variability 
C)  becomes skewed 
D)  becomes more peaked 
A)  becomes flatter 
B)  has greater variability 
C)  becomes skewed 
D)  becomes more peaked

Question 5

A ______ alternative hypothesis (one that may have an ______ symbol) is also referred to as ______.

Accepted Answer

A)  directional; ≠ ; one-tailed 
B)  non-directional; ; asymmetrical 
D)  non-directional; ≠; two-tailed 
A)  directional; ≠ ; one-tailed 
B)  non-directional; ; asymmetrical 
D)  non-directional; ≠; two-tailed

Question 6

A study based on a sample of 22 participants calculates a value of 1.86 for the t-statistic. For alpha (α) = .05 (two-tailed), which of the following is the correct way to present this analysis?

Accepted Answer

A) t(20) = 1.86, p > .01 B) t(21) = 1.86, p > .05 C) t(21) = 1.86, p < .01 D) t(22) = 1.86, p < .05 A) t(20) = 1.86, p > .01 B) t(21) = 1.86, p > .05 C) t(21) = 1.86, p < .01 D) t(22) = 1.86, p < .05

Question 7

Use this information below to answer questions 116-120.
As alcohol-related problems are a concern on college campuses, research has been conducted regarding students' perceptions of drinking behavior. For example, one study found students have misconceptions regarding what is considered excessive ("binge") drinking (White et al, 2004). Imagine you believe students' definition of binge drinking will differ from the government's definition. More specifically, you hypothesize students will overestimate the number of drinks needed to be consumed to be defined as binge drinking. To test this hypothesis, a group of college students are asked, "How many drinks in a row must a man drink in order to define it as "binge drinking?" The responses of some of the students in this class are summarized as:
N = 16   = 7.94
s = 4.63
-What is the value for the standard error of the mean   ?

Accepted Answer

A)  .29 
B)  .50 
C)  .86 
D)  1.16 
A)  .29 
B)  .50 
C)  .86 
D)  1.16

Question 8

Reporting the results of a z-test results typically includes all of the following EXCEPT ______.

Accepted Answer

A)  the variable analyzed 
B)  the standard error of the sample mean 
C)  the sample and population means 
D)  the level of significance 
A)  the variable analyzed 
B)  the standard error of the sample mean 
C)  the sample and population means 
D)  the level of significance

Question 9

A population has a mean of 606 and a standard deviation of 23. For a sample of N = 500, what is the population standard error of the mean   ?

Accepted Answer

A)  .10 
B)  1.02 
C)  1.03 
D)  1.1 
A)  .10 
B)  1.02 
C)  1.03 
D)  1.1

Question 10

A study based on a sample of 13 participants calculates a value of 2.26 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(11) = 2.26, p < .05 
B)  t(12) = 2.26, p < .05 
C)  t(12) = 2.26, p < .01 
D)  t(13) = 2.26, p < .01 
A)  t(11) = 2.26, p < .05 
B)  t(12) = 2.26, p < .05 
C)  t(12) = 2.26, p < .01 
D)  t(13) = 2.26, p < .01

Question 11

In testing the mean of a sample, the sample mean   is transformed into a t-statistic in order to ______.

Accepted Answer

A)  determine the critical values 
B)  prove our research hypotheses 
C)  determine whether the alternative hypothesis (H1) should be one-tailed or two-tailed 
D)  determine the probability of obtaining the value of the sample mean 
A)  determine the critical values 
B)  prove our research hypotheses 
C)  determine whether the alternative hypothesis (H1) should be one-tailed or two-tailed 
D)  determine the probability of obtaining the value of the sample mean

Question 12

A z-statistic of 2.70 is significant at both the .05 and .01 alpha levels for a two-tailed test.

Accepted Answer

A) True 
 B)False

Question 13

A researcher tests the mean of a sample of 28 people and calculates a value of 2.13 for the t-statistic. For α = .05 (two-tailed), which of the following decisions is MOST appropriate?

Accepted Answer

A)  do not reject null (p  .05) 
C)  reject null (p < .05) 
D)  accept null (p < .05) 
A)  do not reject null (p  .05) 
C)  reject null (p < .05) 
D)  accept null (p < .05)

Question 14

The ______ of the sampling distribution of the mean is represented by ______.

Accepted Answer

A)  mean; µ 
B)  variability; s 
C)  mean; 1 
D)  variability; 
A)  mean; µ 
B)  variability; s 
C)  mean; 1 
D)  variability;

Question 15

The statement µ < 10 is an example of a ______.

Accepted Answer

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

Question 16

You determine whether the probability of a statistic such as the t-statistic is < .01 ______.

Accepted Answer

A)  because p < .01 is much more significant than p < .05 
B)  in order to prove the research hypothesis 
C)  because p < .05 is more likely to occur than p < .01 
D)  to be as precise as possible 
A)  because p < .01 is much more significant than p < .05 
B)  in order to prove the research hypothesis 
C)  because p < .05 is more likely to occur than p < .01 
D)  to be as precise as possible

Question 17

A researcher tests the mean of a sample of 16 people and calculates a value of 2.42 for the t-statistic. For α = .05 (two-tailed), which of the following is the MOST appropriate level of significance?

Accepted Answer

A)  p  .05 
C)  p  .01 
A)  p  .05 
C)  p  .01

Question 18

In testing the mean of a sample, calculating a negative value of the t-statistic (t) indicates ______.

Accepted Answer

A)  the sample mean is less than the hypothesized population mean 
B)  the score is less than the mean 
C)    is greater than 
D)  you have made an error in your calculations 
A)  the sample mean is less than the hypothesized population mean 
B)  the score is less than the mean 
C)    is greater than 
D)  you have made an error in your calculations

Question 19

Using the following information, calculate the z-statistic for the z-test for one mean.   = 101 μ = 109   = 3.44

Accepted Answer

A)  -2.32 
B)  2.32 
C)  -2.33 
D)  2.33 
A)  -2.32 
B)  2.32 
C)  -2.33 
D)  2.33

Question 20

Use this information below to answer questions 116-120.
As alcohol-related problems are a concern on college campuses, research has been conducted regarding students' perceptions of drinking behavior. For example, one study found students have misconceptions regarding what is considered excessive ("binge") drinking (White et al, 2004). Imagine you believe students' definition of binge drinking will differ from the government's definition. More specifically, you hypothesize students will overestimate the number of drinks needed to be consumed to be defined as binge drinking. To test this hypothesis, a group of college students are asked, "How many drinks in a row must a man drink in order to define it as "binge drinking?" The responses of some of the students in this class are summarized as:
N = 16   = 7.94
s = 4.63
-The government has defined binge drinking as consuming at least 5 drinks in a row. Therefore, in this study, how would the null and alternative hypotheses be stated?

Accepted Answer

A) H0: μ 1: μ > 5 B) H0: μ = 5; H1: μ ≠ 5 C) H0: μ ≠ 5; H1: μ = 5 D) H0: μ = 5; H1: μ < 5 A) H0: μ 1: μ > 5 B) H0: μ = 5; H1: μ ≠ 5 C) H0: μ ≠ 5; H1: μ = 5 D) H0: μ = 5; H1: μ < 5

For a z-statistic of 2.22, one would conclude (for a two-tailed test) the score is ______.

A is used to evaluate .

A study based on a sample of 17 participants calculates a value of 2.33 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?

Holding all else constant, as sample size increases, the sampling distribution of the mean ______.

A alternative hypothesis (one that may have an symbol) is also referred to as __.

A study based on a sample of 22 participants calculates a value of 1.86 for the t-statistic. For alpha (α) = .05 (two-tailed), which of the following is the correct way to present this analysis?

Reporting the results of a z-test results typically includes all of the following EXCEPT ______.

A population has a mean of 606 and a standard deviation of 23. For a sample of N = 500, what is the population standard error of the mean ?

A study based on a sample of 13 participants calculates a value of 2.26 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?

In testing the mean of a sample, the sample mean is transformed into a t-statistic in order to ______.

A z-statistic of 2.70 is significant at both the .05 and .01 alpha levels for a two-tailed test.

A researcher tests the mean of a sample of 28 people and calculates a value of 2.13 for the t-statistic. For α = .05 (two-tailed), which of the following decisions is MOST appropriate?

The of the sampling distribution of the mean is represented by .

The statement µ < 10 is an example of a ______.

You determine whether the probability of a statistic such as the t-statistic is < .01 ______.

A researcher tests the mean of a sample of 16 people and calculates a value of 2.42 for the t-statistic. For α = .05 (two-tailed), which of the following is the MOST appropriate level of significance?

In testing the mean of a sample, calculating a negative value of the t-statistic (t) indicates ______.

Using the following information, calculate the z-statistic for the z-test for one mean. = 101 μ = 109 = 3.44

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

For a z-statistic of 2.22, one would conclude (for a two-tailed test) the score is ______.

A ______ is used to evaluate ______.

A study based on a sample of 17 participants calculates a value of 2.33 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?

Holding all else constant, as sample size increases, the sampling distribution of the mean ______.

A ______ alternative hypothesis (one that may have an ______ symbol) is also referred to as ______.

A study based on a sample of 22 participants calculates a value of 1.86 for the t-statistic. For alpha (α) = .05 (two-tailed), which of the following is the correct way to present this analysis?

Reporting the results of a z-test results typically includes all of the following EXCEPT ______.

A population has a mean of 606 and a standard deviation of 23. For a sample of N = 500, what is the population standard error of the mean ?

A study based on a sample of 13 participants calculates a value of 2.26 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?

In testing the mean of a sample, the sample mean is transformed into a t-statistic in order to ______.

A z-statistic of 2.70 is significant at both the .05 and .01 alpha levels for a two-tailed test.

A researcher tests the mean of a sample of 28 people and calculates a value of 2.13 for the t-statistic. For α = .05 (two-tailed), which of the following decisions is MOST appropriate?

The ______ of the sampling distribution of the mean is represented by ______.

The statement µ < 10 is an example of a ______.

You determine whether the probability of a statistic such as the t-statistic is < .01 ______.

A researcher tests the mean of a sample of 16 people and calculates a value of 2.42 for the t-statistic. For α = .05 (two-tailed), which of the following is the MOST appropriate level of significance?

In testing the mean of a sample, calculating a negative value of the t-statistic (t) indicates ______.

Using the following information, calculate the z-statistic for the z-test for one mean. = 101 μ = 109 = 3.44

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 is used to evaluate .

A alternative hypothesis (one that may have an symbol) is also referred to as __.

The of the sampling distribution of the mean is represented by .