Question 1

For   and     _____ and   _____ for a one-tailed test with   ,and   .

Accepted Answer

A) -1.530;2.485 
B) -1.530;-2.485 
C) -2.485;1.530 
D) -2.485;-1.530 
A) -1.530;2.485 
B) -1.530;-2.485 
C) -2.485;1.530 
D) -2.485;-1.530 A

Question 2

Which of the following would increase the power of a t-test?

Accepted Answer

A) Changing F1F1F1S1F1F1F10 from 0.05 to 0.01 
B) Increasing the variability in the raw scores 
C) Changing the sample size from N = 25 to N = 100 
D) Changing the sample size from N = 100 to N = 25 
A) Changing F1F1F1S1F1F1F10 from 0.05 to 0.01 
B) Increasing the variability in the raw scores 
C) Changing the sample size from N = 25 to N = 100 
D) Changing the sample size from N = 100 to N = 25 C

Question 3

For   ,and   ,what is   ?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)    D

Question 4

Unless we use the correct   from the t-distribution for the appropriate N,

Accepted Answer

A) we will fail to reject   . 
B) we will always reject   . 
C) the probability of making a Type I error will increase. 
D) the probability of making a Type I error will not equal F1F1F1S1F1F1F10. 
A) we will fail to reject   . 
B) we will always reject   . 
C) the probability of making a Type I error will increase. 
D) the probability of making a Type I error will not equal F1F1F1S1F1F1F10.

Question 5

In a one-tailed significance test for a correlation predicted to be negative,the null hypothesis is _____ and the alternative hypothesis is _____.

Accepted Answer

A)    F1F1F1S1F1F1F10 F1F1F1S1F1F1F10 0;   F1F1F1S1F1F1F10  0;   F1F1F1S1F1F1F10 F1F1F1S1F1F1F10 0 
C)    F1F1F1S1F1F1F10 = 0;   F1F1F1S1F1F1F10  0;   F1F1F1S1F1F1F10 < 0 
A)    F1F1F1S1F1F1F10 F1F1F1S1F1F1F10 0;   F1F1F1S1F1F1F10  0;   F1F1F1S1F1F1F10 F1F1F1S1F1F1F10 0 
C)    F1F1F1S1F1F1F10 = 0;   F1F1F1S1F1F1F10  0;   F1F1F1S1F1F1F10 < 0

Question 6

The critical value for   is obtained using

Accepted Answer

A) N,which is the total number of scores in the sample. 
B) N,which is the number of pairs of scores in the sample. 
C) df,which equals N F1F1F1S1F1F1F10 1,with N being the number of pairs of scores in the sample. 
D) df,which equals N F1F1F1S1F1F1F10 2,with N being the number of pairs of scores in the sample. 
A) N,which is the total number of scores in the sample. 
B) N,which is the number of pairs of scores in the sample. 
C) df,which equals N F1F1F1S1F1F1F10 1,with N being the number of pairs of scores in the sample. 
D) df,which equals N F1F1F1S1F1F1F10 2,with N being the number of pairs of scores in the sample.

Question 7

For   ,and   ,what is   ?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 8

A developmental psychologist interested in the development of color perception presented 20 one-month-old infants with a pair of color forms.One form had two colors and the other had one.If the infants preferred to look at the form with two colors above chance level (50%),they can perceive colors.The mean percentage of times the infants preferred the two-color form was 53.15 (   ).What is   ?

Accepted Answer

A) 0.83 
B) 0.98 
C) 3.72 
D) 4.39 
A) 0.83 
B) 0.98 
C) 3.72 
D) 4.39

Question 9

Using the data given below,perform a two-tailed t-test to compare the sample mean to   .Use   . 38 40 41 37 35 38 41
39 34 35 38 42 44 37

Accepted Answer

A) 2.160 2.160,Reject C) -2.160 > -2.601,Reject D) -2.601 < -2.160,Fail to reject A) 2.160 2.160,Reject C) -2.160 > -2.601,Reject D) -2.601 < -2.160,Fail to reject

Question 10

The Cultural Diversity Task Force sponsored six events last year (e.g. ,Awareness Luncheon)and six events with the same names this year.To see how well the attendance last year correlated with attendance this year,the chairperson ranked the number of people attending each event during each of the two years and calculated a correlation.The chairperson used the Spearman rank-order correlation coefficient   to determine if attendance this year at these events was greater than last year (a positive correlation).The correlation would have to be bigger than _______ to be "significant."

Accepted Answer

A) 0.886 
B) 0.829 
C) 0.645 
D) 0.643 
A) 0.886 
B) 0.829 
C) 0.645 
D) 0.643

Question 11

Which of the following is one of the assumptions of a one-sample t-test?

Accepted Answer

A) The obtained scores are on an ordinal or interval scale. 
B) The population standard deviation is estimated by computing   . 
C) The population standard deviation is known. 
D) The population distribution is skewed. 
A) The obtained scores are on an ordinal or interval scale. 
B) The population standard deviation is estimated by computing   . 
C) The population standard deviation is known. 
D) The population distribution is skewed.

Question 12

Which of the following assumptions is common to both the z-test and the one-sample t-test?

Accepted Answer

A) Alpha is selected to be 0.01. 
B) The raw score population forms a normal distribution,and the population mean and standard deviation are known. 
C) The standard deviation of the raw score population is estimated by   . 
D) There is one random sample of interval or ratio scores. 
A) Alpha is selected to be 0.01. 
B) The raw score population forms a normal distribution,and the population mean and standard deviation are known. 
C) The standard deviation of the raw score population is estimated by   . 
D) There is one random sample of interval or ratio scores.

Question 13

Suppose you perform a two-tailed significance test on a correlation between the number of books read for enjoyment and the number of credit hours taken,using 32 participants.Your   is F1F1F1S1F1F1F100.15,which is not a significant correlation coefficient.Which of the following is the correct way to report this finding?

Accepted Answer

A) r(32)= F1F1F1S1F1F1F100.15,p > 0.05 
B) r(31)= F1F1F1S1F1F1F100.15,p > 0.05 
C) r(30)= F1F1F1S1F1F1F100.15,p  0.05 
A) r(32)= F1F1F1S1F1F1F100.15,p > 0.05 
B) r(31)= F1F1F1S1F1F1F100.15,p > 0.05 
C) r(30)= F1F1F1S1F1F1F100.15,p  0.05

Question 14

What does the shape of any particular sampling distribution of a correlation coefficient depend upon?

Accepted Answer

A) df 
B) µ 
C) r 
D)    
A) df 
B) µ 
C) r 
D)

Question 15

What is the difference between Pearson's and Spearman's correlations when performing a hypothesis test?

Accepted Answer

A) The level of F1F1F1S1F1F1F10 
B) The size of the sample 
C) The assumption that the scores must be randomly selected 
D) How the respective sampling distributions for each correlation are conceptualized 
A) The level of F1F1F1S1F1F1F10 
B) The size of the sample 
C) The assumption that the scores must be randomly selected 
D) How the respective sampling distributions for each correlation are conceptualized

Question 16

Which of the following is the formula for the   in a single-sample t-test?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 17

When is a t-test used instead of a z-test?

Accepted Answer

A) When the population µ is known 
B) When the population deals with two samples 
C) When the population standard deviation is known 
D) When the population standard deviation is unknown 
A) When the population µ is known 
B) When the population deals with two samples 
C) When the population standard deviation is known 
D) When the population standard deviation is unknown

Question 18

Which of the following statements about the correlation coefficient is true?

Accepted Answer

A) One should not accept that a correlation coefficient represents a relationship unless it is significant. 
B) Unless a correlation coefficient is zero,it represents a relationship. 
C) Positive correlation coefficients tend to be significant more often than negative ones. 
D) Sampling error does not apply to the correlation coefficient. 
A) One should not accept that a correlation coefficient represents a relationship unless it is significant. 
B) Unless a correlation coefficient is zero,it represents a relationship. 
C) Positive correlation coefficients tend to be significant more often than negative ones. 
D) Sampling error does not apply to the correlation coefficient.

Question 19

If we reject the null hypothesis in a significance test of correlation,we conclude that our

Accepted Answer

A) indicates a significant difference between the sample correlation coefficient and the true value of F1F1F1S1F1F1F10. 
B) says there is a significant difference between the sample mean and the true population mean. 
C) almost never happens when   is really 0. 
D) represents a   equal to 0. 
A) indicates a significant difference between the sample correlation coefficient and the true value of F1F1F1S1F1F1F10. 
B) says there is a significant difference between the sample mean and the true population mean. 
C) almost never happens when   is really 0. 
D) represents a   equal to 0.

Question 20

If a researcher reports a one-sample t-test with df = 24,how many individuals participated in this study?

Accepted Answer

A) 24 
B) 25 
C) 26 
D) Cannot be determined from the information given 
A) 24 
B) 25 
C) 26 
D) Cannot be determined from the information given

For and _ and _ for a one-tailed test with ,and .

Which of the following would increase the power of a t-test?

For ,and ,what is ?

Unless we use the correct from the t-distribution for the appropriate N,

In a one-tailed significance test for a correlation predicted to be negative,the null hypothesis is _ and the alternative hypothesis is _.

The critical value for is obtained using

For ,and ,what is ?

Using the data given below,perform a two-tailed t-test to compare the sample mean to .Use . 38 40 41 37 35 38 41 39 34 35 38 42 44 37

Which of the following is one of the assumptions of a one-sample t-test?

Which of the following assumptions is common to both the z-test and the one-sample t-test?

What does the shape of any particular sampling distribution of a correlation coefficient depend upon?

What is the difference between Pearson's and Spearman's correlations when performing a hypothesis test?

Which of the following is the formula for the in a single-sample t-test?

When is a t-test used instead of a z-test?

Which of the following statements about the correlation coefficient is true?

If we reject the null hypothesis in a significance test of correlation,we conclude that our

If a researcher reports a one-sample t-test with df = 24,how many individuals participated in this study?

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

Z-Scores and the Normal Curve

The Correlation Coefficient

Linear Regression

Using Probability to Make Decisions About Data

Introduction to Hypothesis Testing

The Two-Sample T-Test

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

Exam 11: Performing the One-Sample T-Test and Testing Correlation Coefficients

For and _____ and _____ for a one-tailed test with ,and .

Which of the following would increase the power of a t-test?

For ,and ,what is ?

Unless we use the correct from the t-distribution for the appropriate N,

In a one-tailed significance test for a correlation predicted to be negative,the null hypothesis is _____ and the alternative hypothesis is _____.

The critical value for is obtained using

For ,and ,what is ?

Using the data given below,perform a two-tailed t-test to compare the sample mean to .Use . 38 40 41 37 35 38 41 39 34 35 38 42 44 37

Which of the following is one of the assumptions of a one-sample t-test?

Which of the following assumptions is common to both the z-test and the one-sample t-test?

What does the shape of any particular sampling distribution of a correlation coefficient depend upon?

What is the difference between Pearson's and Spearman's correlations when performing a hypothesis test?

Which of the following is the formula for the in a single-sample t-test?

When is a t-test used instead of a z-test?

Which of the following statements about the correlation coefficient is true?

If we reject the null hypothesis in a significance test of correlation,we conclude that our

If a researcher reports a one-sample t-test with df = 24,how many individuals participated in this study?

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

Z-Scores and the Normal Curve

The Correlation Coefficient

Linear Regression

Using Probability to Make Decisions About Data

Introduction to Hypothesis Testing

The Two-Sample T-Test

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

For and _ and _ for a one-tailed test with ,and .

In a one-tailed significance test for a correlation predicted to be negative,the null hypothesis is _ and the alternative hypothesis is _.