Question 1

The statement µ > 3 is an example of a ______.

Accepted Answer

A)  directional null hypothesis 
B)  directional alternative hypothesis 
C)  non-directional null hypothesis 
D)  non-directional alternative hypothesis 
A)  directional null hypothesis 
B)  directional alternative hypothesis 
C)  non-directional null hypothesis 
D)  non-directional alternative hypothesis

Question 2

Imagine that for a population of 40, the mean is 10.25 with a standard deviation of 2.10. What is the population standard error of the mean   ?

Accepted Answer

A)  .03 
B)  .33 
C)  .34 
D)  .36 
A)  .03 
B)  .33 
C)  .34 
D)  .36

Question 3

The statement "µ ≠ 3" would be part of a ______.

Accepted Answer

A)  two-tailed, directional hypothesis 
B)  two-tailed, non-directional hypothesis 
C)  one-tailed, directional hypothesis 
D)  one-tailed, non-directional hypothesis 
A)  two-tailed, directional hypothesis 
B)  two-tailed, non-directional hypothesis 
C)  one-tailed, directional hypothesis 
D)  one-tailed, non-directional hypothesis

Question 4

The sampling distribution of the mean helps us ______.

Accepted Answer

A)  calculate descriptive statistics 
B)  set alpha (α) 
C)  determine the probability of a sample mean   
D)  determine whether our variables are normally distributed 
A)  calculate descriptive statistics 
B)  set alpha (α) 
C)  determine the probability of a sample mean   
D)  determine whether our variables are normally distributed

Question 5

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

Accepted Answer

A)  mean; 0 
B)  variability; 0 
C)  variability; 1 
D)  mean; µ 
A)  mean; 0 
B)  variability; 0 
C)  variability; 1 
D)  mean; µ

Question 6

Looking at the degrees of freedom tells you something about ______.

Accepted Answer

A)  the size of the sample 
B)  the directionality of the alternative hypothesis 
C)  the level of significance of a statistic 
D)  the research hypothesis 
A)  the size of the sample 
B)  the directionality of the alternative hypothesis 
C)  the level of significance of a statistic 
D)  the research hypothesis

Question 7

For a z-statistic of 2.79, 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 8

A researcher tests the mean of a sample of 24 people and calculates a value of 1.98 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 > .01) 
B)  do not reject null (p > .05) 
C)  reject null (p  .05) 
A)  do not reject null (p > .01) 
B)  do not reject null (p > .05) 
C)  reject null (p  .05)

Question 9

Use this information below to answer questions 121-122.
A researcher looked at young people's Knowledge of the cost of weddings, where it's been found that many students' estimates of the cost of a wedding was less than the actual average. As a result of this finding, imagine you hypothesize that young people will underestimate the average cost of a wedding gown. To test this hypothesis, a group of college students are asked, "According to the Brides.com ( HYPERLINK "http://www.brides.com/" http://www.brides.com) 2009 American Wedding Survey, what is the average cost of a wedding gown?" The responses of some of the students in this class are summarized as:
N = 28   = 2432.14
s = 1643.18
-According to Brides.com, the average cost of a wedding gown was $1075. Therefore, in this study, how would the null and alternative hypotheses be stated?

Accepted Answer

A)  H0: μ > 1075; H1: μ 0: μ ≠ 1075; H1: μ = 1075 
C)  H0: μ = 1075; H1: μ ≠ 1075 
D)  H0: μ = 2432.14; H1: μ ≠ 2432.14 
A)  H0: μ > 1075; H1: μ 0: μ ≠ 1075; H1: μ = 1075 
C)  H0: μ = 1075; H1: μ ≠ 1075 
D)  H0: μ = 2432.14; H1: μ ≠ 2432.14

Question 10

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

Accepted Answer

A)  when you do not reject the null hypothesis 
B)  because p < .01 is more precise than p < .05 
C)  because p < .01 is more likely to occur than p < .05 
D)  because p < .01 is better than p < .05 
A)  when you do not reject the null hypothesis 
B)  because p < .01 is more precise than p < .05 
C)  because p < .01 is more likely to occur than p < .05 
D)  because p < .01 is better than p < .05

Question 11

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 contains or involves ______.

Accepted Answer

A)  denominator; a sample mean   rather than the population mean (μ) 
B)  numerator; a sample mean   rather than an individual score (X) 
C)  numerator; the variability of individual scores (Xs) rather than sample means   
D)  denominator; the population mean (μ) rather than a sample mean   
A)  denominator; a sample mean   rather than the population mean (μ) 
B)  numerator; a sample mean   rather than an individual score (X) 
C)  numerator; the variability of individual scores (Xs) rather than sample means   
D)  denominator; the population mean (μ) rather than a sample mean

Question 12

The variability of the sampling distribution of the mean may be represented by ______.

Accepted Answer

A)  0 
B)    
C)  σ 
D)  s 
A)  0 
B)    
C)  σ 
D)  s

Question 13

From data collected from a sample of 100 people, you obtain a mean of 16.27 and a standard deviation of 4.56. What is the value for the standard error of the mean   ?

Accepted Answer

A)  .46 
B)  .05 
C)  .16 
D)  4.56 
A)  .46 
B)  .05 
C)  .16 
D)  4.56

Question 14

The decision to use a directional versus non-directional alternative hypothesis most directly affects ______.

Accepted Answer

A)  the critical value(s) 
B)  alpha () 
C)  the sample size 
D)  the degrees of freedom 
A)  the critical value(s) 
B)  alpha () 
C)  the sample size 
D)  the degrees of freedom

The statement µ > 3 is an example of a ______.

Imagine that for a population of 40, the mean is 10.25 with a standard deviation of 2.10. What is the population standard error of the mean ?

The statement "µ ≠ 3" would be part of a ______.

The sampling distribution of the mean helps us ______.

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

Looking at the degrees of freedom tells you something about ______.

For a z-statistic of 2.79, one would conclude (for a two-tailed test) the score is ______.

A researcher tests the mean of a sample of 24 people and calculates a value of 1.98 for the t-statistic. For α = .05 (two-tailed), which of the following decisions is MOST appropriate?

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

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 contains or involves .

The variability of the sampling distribution of the mean may be represented by ______.

From data collected from a sample of 100 people, you obtain a mean of 16.27 and a standard deviation of 4.56. What is the value for the standard error of the mean ?

The decision to use a directional versus non-directional alternative hypothesis most directly affects ______.

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

The statement µ > 3 is an example of a ______.

Imagine that for a population of 40, the mean is 10.25 with a standard deviation of 2.10. What is the population standard error of the mean ?

The statement "µ ≠ 3" would be part of a ______.

The sampling distribution of the mean helps us ______.

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

Looking at the degrees of freedom tells you something about ______.

For a z-statistic of 2.79, one would conclude (for a two-tailed test) the score is ______.

A researcher tests the mean of a sample of 24 people and calculates a value of 1.98 for the t-statistic. For α = .05 (two-tailed), which of the following decisions is MOST appropriate?

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

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 contains or involves ______.

The variability of the sampling distribution of the mean may be represented by ______.

From data collected from a sample of 100 people, you obtain a mean of 16.27 and a standard deviation of 4.56. What is the value for the standard error of the mean ?

The decision to use a directional versus non-directional alternative hypothesis most directly affects ______.

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

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

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 contains or involves .