Question 1

The estimation formula for the one-sample z is    .

Accepted Answer

A) True 
 B)False

Question 2

A researcher estimates the 90% CI for a sample with a mean of M = 8.9 and a standard error (   )of 2.1.What is the confidence interval at this level of confidence?

Accepted Answer

A) 90% CI 4.8,13.0 
B) 90% CI 5.5,12.4 
C) 90% CI 6.8,11.0 
D) There is not enough information to answer this question. 
A) 90% CI 4.8,13.0 
B) 90% CI 5.5,12.4 
C) 90% CI 6.8,11.0 
D) There is not enough information to answer this question.

Question 3

In a sample of 14 participants,a researcher estimates the 90% CI for a sample with a mean of   = 10.7 and an estimated standard error for the difference (   )of 2.9.What is the confidence interval at this level of confidence?

Accepted Answer

A) 90% CI 4.4,17.0 
B) 90% CI 5.5,15.9 
C) 90% CI 7.8,13.6 
D) There is not enough information to answer this question. 
A) 90% CI 4.4,17.0 
B) 90% CI 5.5,15.9 
C) 90% CI 7.8,13.6 
D) There is not enough information to answer this question.

Question 4

A point estimate is typically reported with an interval estimate.Why?

Accepted Answer

A) Using only a point estimate is associated with low certainty. 
B) The interval estimate gives researchers a higher level of confidence. 
C) The interval estimate adds certainty to the estimate of the population mean. 
D) all of the above 
A) Using only a point estimate is associated with low certainty. 
B) The interval estimate gives researchers a higher level of confidence. 
C) The interval estimate adds certainty to the estimate of the population mean. 
D) all of the above

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Which of the following words best describes certainty?

Accepted Answer

A) inferential 
B) significance 
C) precision 
D) confidence 
A) inferential 
B) significance 
C) precision 
D) confidence

Question 7

The estimation formula for the two-independent sample t is   .

Accepted Answer

A) True 
 B)False

Question 8

Which type of error is used to compute the confidence interval for one sample selected from a population with an unknown variance?

Accepted Answer

A) standard error 
B) estimated standard error 
C) estimated standard error for the difference 
D) estimated standard error for the difference scores 
A) standard error 
B) estimated standard error 
C) estimated standard error for the difference 
D) estimated standard error for the difference scores

Question 9

Researchers can infer decisions made in hypothesis testing based on information provided by confidence intervals.

Accepted Answer

A) True 
 B)False

Question 10

Which type of error is used to compute the confidence interval for two independent samples selected from at least one population with an unknown variance?

Accepted Answer

A) standard error 
B) estimated standard error 
C) estimated standard error for the difference 
D) estimated standard error for the difference scores 
A) standard error 
B) estimated standard error 
C) estimated standard error for the difference 
D) estimated standard error for the difference scores

Question 11

As the standard error increases,the precision of an estimate also increases.

Accepted Answer

A) True 
 B)False

Question 12

The least certain,but most precise,estimate is a point estimate.

Accepted Answer

A) True 
 B)False

Question 13

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 lower 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 14

The estimated standard error is used in the formula to estimate the population mean for the one-sample z.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is a characteristic of confidence intervals?

Accepted Answer

A) The less certain an estimate,the more precise the estimate. 
B) The more certain an estimate,the less precise the estimate. 
C) both A and B 
A) The less certain an estimate,the more precise the estimate. 
B) The more certain an estimate,the less precise the estimate. 
C) both A and B

Question 16

If the null hypothesis is inside the confidence interval,then the decision was likely to ________ using hypothesis testing.

Accepted Answer

A) reject the null hypothesis 
B) retain the null hypothesis 
A) reject the null hypothesis 
B) retain the null hypothesis

Question 17

In a sample of 28 participants,a researcher estimates the 95% CI for a sample with a mean of M = 1.5 and an estimated standard error (   )of 0.3.What is the confidence interval at this level of confidence?

Accepted Answer

A) 95% CI 1.0,2.0 
B) 95% CI 1.2,1.8 
C) 95% CI 0.9,2.1 
D) There is not enough information to answer this question. 
A) 95% CI 1.0,2.0 
B) 95% CI 1.2,1.8 
C) 95% CI 0.9,2.1 
D) There is not enough information to answer this question.

Question 18

A researcher estimates the 95% CI for a sample with a mean of M = 3.26 and a standard error (   )of 0.91.What is the upper confidence limit for this interval?

Accepted Answer

A) 1.48 
B) 2.35 
C) 4.17 
D) 5.04 
A) 1.48 
B) 2.35 
C) 4.17 
D) 5.04

Question 19

The confidence interval for samples selected from a population with an unknown variance is computed using critical values from the t table.This is true for which of the following types of samples?

Accepted Answer

A) one-sample 
B) two-independent sample 
C) related samples 
D) all of the above 
A) one-sample 
B) two-independent sample 
C) related samples 
D) all of the above

Question 20

The larger the level of confidence,the ________ precise the interval estimate.

Accepted Answer

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

The estimation formula for the one-sample z is .

A researcher estimates the 90% CI for a sample with a mean of M = 8.9 and a standard error ( )of 2.1.What is the confidence interval at this level of confidence?

In a sample of 14 participants,a researcher estimates the 90% CI for a sample with a mean of = 10.7 and an estimated standard error for the difference ( )of 2.9.What is the confidence interval at this level of confidence?

A point estimate is typically reported with an interval estimate.Why?

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

Which of the following words best describes certainty?

The estimation formula for the two-independent sample t is .

Which type of error is used to compute the confidence interval for one sample selected from a population with an unknown variance?

Researchers can infer decisions made in hypothesis testing based on information provided by confidence intervals.

Which type of error is used to compute the confidence interval for two independent samples selected from at least one population with an unknown variance?

As the standard error increases,the precision of an estimate also increases.

The least certain,but most precise,estimate is a point estimate.

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 lower confidence limit for this interval?

The estimated standard error is used in the formula to estimate the population mean for the one-sample z.

Which of the following is a characteristic of confidence intervals?

If the null hypothesis is inside the confidence interval,then the decision was likely to ________ using hypothesis testing.

In a sample of 28 participants,a researcher estimates the 95% CI for a sample with a mean of M = 1.5 and an estimated standard error ( )of 0.3.What is the confidence interval at this level of confidence?

A researcher estimates the 95% CI for a sample with a mean of M = 3.26 and a standard error ( )of 0.91.What is the upper confidence limit for this interval?

The confidence interval for samples selected from a population with an unknown variance is computed using critical values from the t table.This is true for which of the following types of samples?

The larger the level of confidence,the ________ precise the 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

The estimation formula for the one-sample z is .

A researcher estimates the 90% CI for a sample with a mean of M = 8.9 and a standard error ( )of 2.1.What is the confidence interval at this level of confidence?

In a sample of 14 participants,a researcher estimates the 90% CI for a sample with a mean of = 10.7 and an estimated standard error for the difference ( )of 2.9.What is the confidence interval at this level of confidence?

A point estimate is typically reported with an interval estimate.Why?

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

Which of the following words best describes certainty?

The estimation formula for the two-independent sample t is .

Which type of error is used to compute the confidence interval for one sample selected from a population with an unknown variance?

Researchers can infer decisions made in hypothesis testing based on information provided by confidence intervals.

Which type of error is used to compute the confidence interval for two independent samples selected from at least one population with an unknown variance?

As the standard error increases,the precision of an estimate also increases.

The least certain,but most precise,estimate is a point estimate.

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 lower confidence limit for this interval?

The estimated standard error is used in the formula to estimate the population mean for the one-sample z.

Which of the following is a characteristic of confidence intervals?

If the null hypothesis is inside the confidence interval,then the decision was likely to ________ using hypothesis testing.

In a sample of 28 participants,a researcher estimates the 95% CI for a sample with a mean of M = 1.5 and an estimated standard error ( )of 0.3.What is the confidence interval at this level of confidence?

A researcher estimates the 95% CI for a sample with a mean of M = 3.26 and a standard error ( )of 0.91.What is the upper confidence limit for this interval?

The confidence interval for samples selected from a population with an unknown variance is computed using critical values from the t table.This is true for which of the following types of samples?

The larger the level of confidence,the ________ precise the 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