Question 1

A researcher reduces her level of confidence from 99% to 90%.What will happen to the precision of her estimate?

Accepted Answer

A) The estimate will be more precise. 
B) The estimate will be less precise. 
C) The precision of her estimate will not change. 
D) It depends on the size of the population. 
A) The estimate will be more precise. 
B) The estimate will be less precise. 
C) The precision of her estimate will not change. 
D) It depends on the size of the population. A

Question 2

Which of the following explains why point estimation can be a useful procedure to estimate a population mean?

Accepted Answer

A) It defines the range of scores within which the population mean is likely to be contained. 
B) The sample mean is equal to the population mean on average. 
C) The sample mean is an unbiased estimator of the population mean. 
D) both B and C 
A) It defines the range of scores within which the population mean is likely to be contained. 
B) The sample mean is equal to the population mean on average. 
C) The sample mean is an unbiased estimator of the population mean. 
D) both B and C D

Question 3

A statistical procedure in which a sample statistic is used to estimate the value of an unknown population parameter is called

Accepted Answer

A) an educated guess 
B) appropriation 
C) estimation 
D) significance testing 
A) an educated guess 
B) appropriation 
C) estimation 
D) significance testing C

Question 4

The confidence interval for one sample selected from a population with a known variance is computed using a critical value for which type of test?

Accepted Answer

A) z test 
B) t test 
C) none 
D) both A and B 
A) z test 
B) t test 
C) none 
D) both A and B

Question 5

The smaller the level of confidence,the ________ precise the estimate.

Accepted Answer

A) more 
B) less 
A) more 
B) less

Question 6

A researcher compares the height of male executives in the U.S.to the average height of males (µ = 67 inches).He determines that the average height of male executives is 70 inches (95% confidence interval [CI] 68-72).Based on this result,what would the decision have been for a hypothesis test?

Accepted Answer

A) Reject the null hypothesis. 
B) Retain the null hypothesis. 
C) There is not enough information to answer this question. 
A) Reject the null hypothesis. 
B) Retain the null hypothesis. 
C) There is not enough information to answer this question.

Question 7

In a sample of 18 participants,a researcher estimates the 80% CI for a sample with a mean of   = 8.8 and an estimated standard error for the difference (   )of 1.8.What is the upper confidence limit for this interval?

Accepted Answer

A) 6.4 
B) 7.0 
C) 10.6 
D) 11.2 
A) 6.4 
B) 7.0 
C) 10.6 
D) 11.2

Question 8

If the value stated by a null hypothesis is ________ the confidence interval,then the decision would have likely been to retain the null hypothesis.

Accepted Answer

A) inside 
B) outside 
A) inside 
B) outside

Question 9

When the null hypothesis is outside a confidence interval,this indicates that it would likely be retained with hypothesis testing.

Accepted Answer

A) True 
 B)False

Question 10

In a sample of 30 participants,a researcher estimates the 95% CI for a sample with a mean of   = 0.7 and an estimated standard error for the difference (   )of 0.2.What is the confidence interval at this level of confidence?

Accepted Answer

A) 95% CI 0.4,1.0 
B) 95% CI 0.5,0.9 
C) 95% CI 0.3,1.1 
D) There is not enough information to answer this question. 
A) 95% CI 0.4,1.0 
B) 95% CI 0.5,0.9 
C) 95% CI 0.3,1.1 
D) There is not enough information to answer this question.

Question 11

Which of the following best describes the goal of estimation?

Accepted Answer

A) to determine the extent to which a result is significant 
B) to estimate the significance of a result 
C) to narrow in on the true population mean by defining limits within which it is likely to be contained 
D) both A and B 
A) to determine the extent to which a result is significant 
B) to estimate the significance of a result 
C) to narrow in on the true population mean by defining limits within which it is likely to be contained 
D) both A and B

Question 12

In a sample of 20 participants,a researcher estimates the 95% CI for a sample with a mean of M = 5.4 and an estimated standard error (   )of 1.6.What is the lower confidence limit for this interval?

Accepted Answer

A) 2.1 
B) 3.8 
C) 7.0 
D) 8.8 
A) 2.1 
B) 3.8 
C) 7.0 
D) 8.8

Question 13

If the value stated by a null hypothesis is ________ the confidence interval,then the decision would likely be to reject the null hypothesis.

Accepted Answer

A) inside 
B) outside 
A) inside 
B) outside

Question 14

A researcher increases his level of confidence from 90% to 95%.What will happen to the precision of his estimate?

Accepted Answer

A) The estimate will be more precise. 
B) The estimate will be less precise. 
C) The precision of his estimate will not change. 
D) It depends on the size of the population. 
A) The estimate will be more precise. 
B) The estimate will be less precise. 
C) The precision of his estimate will not change. 
D) It depends on the size of the population.

Question 15

The estimation formula for the related samples t is   .

Accepted Answer

A) True 
 B)False

Question 16

A researcher estimates the 95% CI for a sample with a mean of M = 9.0 and a standard error (   )of 1.03.What is the confidence interval at this level of confidence?

Accepted Answer

A) 95% CI 7.3,10.7 
B) 95% CI 8.0,10.0 
C) 95% CI 7.0,11.0 
D) There is not enough information to answer this question. 
A) 95% CI 7.3,10.7 
B) 95% CI 8.0,10.0 
C) 95% CI 7.0,11.0 
D) There is not enough information to answer this question.

Question 17

The estimation formula for the one-sample t is    .

Accepted Answer

A) True 
 B)False

Question 18

A matched-pairs design is one example of a situation in which it is appropriate to use the estimation formula for the related samples t.

Accepted Answer

A) True 
 B)False

Question 19

A researcher reports that college students consume an average of 3.6 alcoholic drinks per week.What is the interval estimate in this example?

Accepted Answer

A) 3.6 
B) The interval estimate is not given. 
A) 3.6 
B) The interval estimate is not given.

Question 20

There is no difference between a point estimate and an interval estimate.

Accepted Answer

A) True 
 B)False

A researcher reduces her level of confidence from 99% to 90%.What will happen to the precision of her estimate?

Which of the following explains why point estimation can be a useful procedure to estimate a population mean?

A statistical procedure in which a sample statistic is used to estimate the value of an unknown population parameter is called

The confidence interval for one sample selected from a population with a known variance is computed using a critical value for which type of test?

The smaller the level of confidence,the ________ precise the estimate.

A researcher compares the height of male executives in the U.S.to the average height of males (µ = 67 inches).He determines that the average height of male executives is 70 inches (95% confidence interval [CI] 68-72).Based on this result,what would the decision have been for a hypothesis test?

In a sample of 18 participants,a researcher estimates the 80% CI for a sample with a mean of = 8.8 and an estimated standard error for the difference ( )of 1.8.What is the upper confidence limit for this interval?

If the value stated by a null hypothesis is ________ the confidence interval,then the decision would have likely been to retain the null hypothesis.

When the null hypothesis is outside a confidence interval,this indicates that it would likely be retained with hypothesis testing.

In a sample of 30 participants,a researcher estimates the 95% CI for a sample with a mean of = 0.7 and an estimated standard error for the difference ( )of 0.2.What is the confidence interval at this level of confidence?

Which of the following best describes the goal of estimation?

In a sample of 20 participants,a researcher estimates the 95% CI for a sample with a mean of M = 5.4 and an estimated standard error ( )of 1.6.What is the lower confidence limit for this interval?

If the value stated by a null hypothesis is ________ the confidence interval,then the decision would likely be to reject the null hypothesis.

A researcher increases his level of confidence from 90% to 95%.What will happen to the precision of his estimate?

The estimation formula for the related samples t is .

A researcher estimates the 95% CI for a sample with a mean of M = 9.0 and a standard error ( )of 1.03.What is the confidence interval at this level of confidence?

The estimation formula for the one-sample t is .

A matched-pairs design is one example of a situation in which it is appropriate to use the estimation formula for the related samples t.

A researcher reports that college students consume an average of 3.6 alcoholic drinks per week.What is the interval estimate in this example?

There is no difference between a point estimate and an interval estimate.

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, Normal Distributions, and Z Scores

Probability and Sampling Distributions

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample and Two-Independent Sample T Tests

Testing Means: Related Samples T Test

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated Measures Design

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

Exam 11: Estimation and Confidence Intervals

A researcher reduces her level of confidence from 99% to 90%.What will happen to the precision of her estimate?

Which of the following explains why point estimation can be a useful procedure to estimate a population mean?

A statistical procedure in which a sample statistic is used to estimate the value of an unknown population parameter is called

The confidence interval for one sample selected from a population with a known variance is computed using a critical value for which type of test?

The smaller the level of confidence,the ________ precise the estimate.

A researcher compares the height of male executives in the U.S.to the average height of males (µ = 67 inches).He determines that the average height of male executives is 70 inches (95% confidence interval [CI] 68-72).Based on this result,what would the decision have been for a hypothesis test?

In a sample of 18 participants,a researcher estimates the 80% CI for a sample with a mean of = 8.8 and an estimated standard error for the difference ( )of 1.8.What is the upper confidence limit for this interval?

If the value stated by a null hypothesis is ________ the confidence interval,then the decision would have likely been to retain the null hypothesis.

When the null hypothesis is outside a confidence interval,this indicates that it would likely be retained with hypothesis testing.

In a sample of 30 participants,a researcher estimates the 95% CI for a sample with a mean of = 0.7 and an estimated standard error for the difference ( )of 0.2.What is the confidence interval at this level of confidence?

Which of the following best describes the goal of estimation?

In a sample of 20 participants,a researcher estimates the 95% CI for a sample with a mean of M = 5.4 and an estimated standard error ( )of 1.6.What is the lower confidence limit for this interval?

If the value stated by a null hypothesis is ________ the confidence interval,then the decision would likely be to reject the null hypothesis.

A researcher increases his level of confidence from 90% to 95%.What will happen to the precision of his estimate?

The estimation formula for the related samples t is .

A researcher estimates the 95% CI for a sample with a mean of M = 9.0 and a standard error ( )of 1.03.What is the confidence interval at this level of confidence?

The estimation formula for the one-sample t is .

A matched-pairs design is one example of a situation in which it is appropriate to use the estimation formula for the related samples t.

A researcher reports that college students consume an average of 3.6 alcoholic drinks per week.What is the interval estimate in this example?

There is no difference between a point estimate and an interval estimate.

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, Normal Distributions, and Z Scores

Probability and Sampling Distributions

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample and Two-Independent Sample T Tests

Testing Means: Related Samples T Test

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated Measures Design

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters