Question 1

When the number of degrees of freedom is very large,

Accepted Answer

A)  z will be essentially equal to t 
B)  s will be very close to   
C)  
   will be very close to 
   
D)  all of the above will be true 
A)  z will be essentially equal to t 
B)  s will be very close to   
C)  
   will be very close to 
   
D)  all of the above will be true

Question 2

Given:   
 If 
   
 is rejected, this means that

Accepted Answer

A)  the null hypothesis is false 
B)  it seems likely that the null hypothesis is false 
C)  n was not large enough 
D)  the test should be repeated 
A)  the null hypothesis is false 
B)  it seems likely that the null hypothesis is false 
C)  n was not large enough 
D)  the test should be repeated

Question 3

The schizophrenia scale on a widely used personality scale is standardized to have a mean of 50 for a national group of normal adults. You administer the scale to a random sample of 20 students from a large university and obtain the following results: 
   Is there any reason to believe that the norms based on the national standardization group are inappropriate for college students?
(a)Set up 
   
 and 
   
(b)Determine the critical value(s) of 
   
(c)Perform the statistical test.
 (d)  Draw final conclusions.

Accepted Answer

(a) 
@#IMG-DLM& 
(b) 
 @#IMG-DLM&

(c) 
 @#IMG-DLM& 
 @#IMG-DLM& 
 re

Question 4

The statistical hypothesis to be tested is called the

Accepted Answer

A)  experimental hypothesis 
B)  normal hypothesis 
C)  population hypothesis 
D)  null hypothesis 
A)  experimental hypothesis 
B)  normal hypothesis 
C)  population hypothesis 
D)  null hypothesis

Question 5

Student's distribution of t has nothing to offer in obtaining relief from which problem, if any?

Accepted Answer

A)  small sample size 
B)  unknown population standard deviations 
C)  nonnormality of the population distributions 
D)  it offers relief in all of the above situations 
A)  small sample size 
B)  unknown population standard deviations 
C)  nonnormality of the population distributions 
D)  it offers relief in all of the above situations

Question 6

The region of rejection typically appears where in the sampling distribution?

Accepted Answer

A)  above the mean 
B)  below the mean 
C)  in the center 
D)  at the extremes 
A)  above the mean 
B)  below the mean 
C)  in the center 
D)  at the extremes

Question 7

If we test   
 against 
   
 the region of rejection will be located

Accepted Answer

A)  at the extreme right 
B)  at the extreme left 
C)  at the two extremes 
D)  in the center 
A)  at the extreme right 
B)  at the extreme left 
C)  at the two extremes 
D)  in the center

Question 8

The criterion by which a decision is made about the null hypothesis is called

Accepted Answer

A)  the level of significance 
B)  alpha 
C)  either of the above 
D)  the alternative hypothesis 
A)  the level of significance 
B)  alpha 
C)  either of the above 
D)  the alternative hypothesis

Question 9

A large suburban school district is contemplating instituting a special program to combat overweight in elementary school boys. In order to determine whether such a program is warranted, a random sample of 36 fourth-grade boys is selected. Then, for each boy the difference between his actual weight and the weight recommended for his height and age is recorded. A positive difference indicates overweight and a negative difference, underweight. The following results are obtained (in pounds):

(a) Set up 
   
 and 
 
   .
(b)Perform the statistical test (   (c)Draw final conclusions.

Accepted Answer

(a)  
 @#IMG-DLM& (b)  
 @#IMG-DLM& 
; reject
 @#IMG-DLM&

Question 10

When the value of   
 is changed from .05 to .01,

Accepted Answer

A)  the greater the desirability of using a two-tailed test 
B)  the greater the value of t required to reject the null hypothesis 
C)  the smaller the region of retention 
D)  we should be less confident about our decision if that decision is to reject the null hypothesis 
A)  the greater the desirability of using a two-tailed test 
B)  the greater the value of t required to reject the null hypothesis 
C)  the smaller the region of retention 
D)  we should be less confident about our decision if that decision is to reject the null hypothesis

Question 11

We expect the alternative hypothesis to be a

Accepted Answer

A)  particular value of a statistic 
B)  range of values of a statistic 
C)  particular value of a parameter 
D)  range of values of a parameter 
A)  particular value of a statistic 
B)  range of values of a statistic 
C)  particular value of a parameter 
D)  range of values of a parameter

Question 12

According to the information contained in the sampling distribution, we reject the null hypothesis if the probability of obtaining such a sample mean is

Accepted Answer

A)  known 
B)  estimated 
C)  low 
D)  high 
A)  known 
B)  estimated 
C)  low 
D)  high

Question 13

If we were able to calculate both   
 and 
   
 we should

Accepted Answer

A)  prefer   
B)  prefer   
C)  calculate either; they will be equivalent 
D)  prefer 
   for large samples and 
 
   for small samples 
A)  prefer   
B)  prefer   
C)  calculate either; they will be equivalent 
D)  prefer 
   for large samples and 
 
   for small samples

Question 14

When the average scores for two groups are found to be "statistically significant," it means that the results

Accepted Answer

A)  are important 
B)  are of practical use 
C)  had a low probability of occurring by chance 
D)  all of the above 
A)  are important 
B)  are of practical use 
C)  had a low probability of occurring by chance 
D)  all of the above

When the number of degrees of freedom is very large,

Given: If is rejected, this means that

The statistical hypothesis to be tested is called the

Student's distribution of t has nothing to offer in obtaining relief from which problem, if any?

The region of rejection typically appears where in the sampling distribution?

If we test against the region of rejection will be located

The criterion by which a decision is made about the null hypothesis is called

When the value of is changed from .05 to .01,

We expect the alternative hypothesis to be a

According to the information contained in the sampling distribution, we reject the null hypothesis if the probability of obtaining such a sample mean is

If we were able to calculate both and we should

When the average scores for two groups are found to be "statistically significant," it means that the results

Introduction

Frequency Distributions, Percentiles,

Graphic Representation of Frequency Distributions

Central Tendency

Variability and Standard Z Scores

Standard Scores and the Normal Curve

Correlation

Prediction

Interpretive Aspects of Correlation and Regression

Probability

Random Sampling and Sampling Distributions

Interpreting the Results of Hypothesis Testing: Effect Size, Type I and Type II Errors, and Power

Testing Hypotheses About the Difference Between Two Independent Groups

Testing for a Difference

Inference About Correlation Coefficients

An Alternative to Hypothesis Testing: Confidence Intervals

Testing for Differences Among Three or More Groups: One-Way Analysis of Variance and Some Alternatives

Factorial Analysis of Variance

Chi-Square and Inference About Frequencies

Some Almost Assumption-Free Tests

Filters

Exam 12: Introduction to Statistical Inference: Testing Hypotheses About Single Means Z and T

When the number of degrees of freedom is very large,

Given: If is rejected, this means that

The statistical hypothesis to be tested is called the

Student's distribution of t has nothing to offer in obtaining relief from which problem, if any?

The region of rejection typically appears where in the sampling distribution?

If we test against the region of rejection will be located

The criterion by which a decision is made about the null hypothesis is called

When the value of is changed from .05 to .01,

We expect the alternative hypothesis to be a

According to the information contained in the sampling distribution, we reject the null hypothesis if the probability of obtaining such a sample mean is

If we were able to calculate both and we should

When the average scores for two groups are found to be "statistically significant," it means that the results

Introduction

Frequency Distributions, Percentiles,

Graphic Representation of Frequency Distributions

Central Tendency

Variability and Standard Z Scores

Standard Scores and the Normal Curve

Correlation

Prediction

Interpretive Aspects of Correlation and Regression

Probability

Random Sampling and Sampling Distributions

Interpreting the Results of Hypothesis Testing: Effect Size, Type I and Type II Errors, and Power

Testing Hypotheses About the Difference Between Two Independent Groups

Testing for a Difference

Inference About Correlation Coefficients

An Alternative to Hypothesis Testing: Confidence Intervals

Testing for Differences Among Three or More Groups: One-Way Analysis of Variance and Some Alternatives

Factorial Analysis of Variance

Chi-Square and Inference About Frequencies

Some Almost Assumption-Free Tests

Filters