Question 1

When the level of confidence is increased, the range of values ______ and becomes ________ specific.

Accepted Answer

A)  narrows; less 
B)  narrows; more 
C)  broadens; more 
D)  broadens; less 
A)  narrows; less 
B)  narrows; more 
C)  broadens; more 
D)  broadens; less D

Question 2

Based on the summary data below, construct a 98% confidence interval for μD.
MD = 8
n = 24
SSD = 893

Accepted Answer

α = .02
df = 23
t = ±2.5
     LL = 8 - (2.5)(1.27) = 4.82 and UL = 8 + (2.5)(1.27) = 11.18

Question 3

Which is the correct formula for the upper limit of a confidence interval for a one-sample t test?

Accepted Answer

A)  M + t(sM) 
B)  μ + t(sM) 
C)  MD + t (sM
D)  
D)  μD + t (sM
D)  
A)  M + t(sM) 
B)  μ + t(sM) 
C)  MD + t (sM
D)  
D)  μD + t (sM
D)  A

Question 4

Point estimates involve _______ values and are _______ specific than confidence intervals.

Accepted Answer

A)  a range of; less 
B)  single; more 
C)  a range of; more 
D)  single; less 
A)  a range of; less 
B)  single; more 
C)  a range of; more 
D)  single; less

Question 5

As compared to point estimates, confidence intervals are

Accepted Answer

A)  less specific but we can have greater confidence that they will include the population values. 
B)  more specific and we have greater confidence that they will include the population values. 
C)  less specific and we have less confidence that they will include the population values. 
D)  more specific but we have less confidence that they will include the population values. 
A)  less specific but we can have greater confidence that they will include the population values. 
B)  more specific and we have greater confidence that they will include the population values. 
C)  less specific and we have less confidence that they will include the population values. 
D)  more specific but we have less confidence that they will include the population values.

Question 6

For an independent samples t test, the point estimate would be

Accepted Answer

A)  μ₁ - μ₂ 
B)  M₁ - M₂ 
C)    
D)  MD 
A)  μ₁ - μ₂ 
B)  M₁ - M₂ 
C)    
D)  MD

Question 7

A study was conducted to determine the effectiveness of interval training (alternating between walking and running at a fast pace) on running speed. A sample of n = 9 runners improved their speed on 5K runs after the training by an average of MD = 1.58 minutes with sD = .61. The values for a 95% confidence interval for μD would be

Accepted Answer

A)  .20 to 3.18 
B)  .17 to 2.99 
C)  1.13 to 2.04 
D)  .14 to 3.02 
A)  .20 to 3.18 
B)  .17 to 2.99 
C)  1.13 to 2.04 
D)  .14 to 3.02

Question 8

Which of the following components is not needed for calculating the lower and upper limits of a confidence interval?

Accepted Answer

A)  an obtained statistic 
B)  a population parameter 
C)  a t-value 
D)  the estimated standard error 
A)  an obtained statistic 
B)  a population parameter 
C)  a t-value 
D)  the estimated standard error

Question 9

The scores before a treatment intervention were 10, 8, 11, 9, and 8. The scores after the intervention were 6, 5, 6, 3, and 5, respectively. What is the point estimate for μD?

Accepted Answer

Point esti

Question 10

Which of the following is NOT true of confidence intervals?

Accepted Answer

A)  They take sampling error into consideration. 
B)  They are expected to include a population parameter. 
C)  They include a range of values. 
D)  They are more specific than point estimates. 
A)  They take sampling error into consideration. 
B)  They are expected to include a population parameter. 
C)  They include a range of values. 
D)  They are more specific than point estimates.

Question 11

Based on the summary data below, construct a 90% confidence interval for μ.
M = 50
n = 15
sM = 3

Accepted Answer

LL = 50 - (1.761)(3)

Question 12

Based on the summary data below, construct a 95% confidence interval forμ.
M = 25
n = 12
SS = 200

Accepted Answer

The answer of Based on the summary data below, construct...

Question 13

To determine the point estimate of a population parameter, use

Accepted Answer

A)  the obtained sample values with an adjustment for standard error. 
B)  the denominator of the t test. 
C)  the numerator of the t test. 
D)  the appropriate confidence interval. 
A)  the obtained sample values with an adjustment for standard error. 
B)  the denominator of the t test. 
C)  the numerator of the t test. 
D)  the appropriate confidence interval.

Question 14

For a one-sample t test, the point estimate would be

Accepted Answer

A)  M 
B)  μ 
C)  MD 
D)  μD 
A)  M 
B)  μ 
C)  MD 
D)  μD

Question 15

If we wanted to make a point estimate for μ₁ - μ₂, what statistic would we use?

Accepted Answer

The answer of If we wanted to make a point...

Question 16

If we wanted to estimate an 80% confidence interval for a two-sample repeated measures t test with a sample size of n = 23, what t values would we use?

Accepted Answer

A)  ±1.323 
B)  ±1.721 
C)  ±1.717 
D)  ±1.321 
A)  ±1.323 
B)  ±1.721 
C)  ±1.717 
D)  ±1.321

Question 17

Given the scores 10, 12, 15, and 20, what is the point estimate for μ?

Accepted Answer

A)  57 
B)  14.25 
C)  19 
D)  ±10 
A)  57 
B)  14.25 
C)  19 
D)  ±10

Question 18

If we want to establish a 99% confidence interval for the population mean, then our interval would fail to capture μ _____ percent of the time.

Accepted Answer

A)  1 
B)  10 
C)  100 
D)  .5 
A)  1 
B)  10 
C)  100 
D)  .5

Question 19

If we have established a 99% confidence interval for μ of 40 to 60, what would be the correct interpretation?

Accepted Answer

A)  99% of sample means would fall between 40 and 60. 
B)  99% of population means would fall between 40 and 60. 
C)  We can be 99% confident that μ would be between 40 and 60. 
D)  We can be 99% confident that M would be between 40 and 60. 
A)  99% of sample means would fall between 40 and 60. 
B)  99% of population means would fall between 40 and 60. 
C)  We can be 99% confident that μ would be between 40 and 60. 
D)  We can be 99% confident that M would be between 40 and 60.

Question 20

What is the relationship between level of confidence and the width of the confidence interval?

Accepted Answer

As the level of confidence inc

When the level of confidence is increased, the range of values and becomes __ specific.

Based on the summary data below, construct a 98% confidence interval for μ_D. M_D = 8 n = 24 SS_D = 893

Which is the correct formula for the upper limit of a confidence interval for a one-sample t test?

Point estimates involve _ values and are _ specific than confidence intervals.

As compared to point estimates, confidence intervals are

For an independent samples t test, the point estimate would be

Which of the following components is not needed for calculating the lower and upper limits of a confidence interval?

The scores before a treatment intervention were 10, 8, 11, 9, and 8. The scores after the intervention were 6, 5, 6, 3, and 5, respectively. What is the point estimate for μ_D?

Which of the following is NOT true of confidence intervals?

Based on the summary data below, construct a 90% confidence interval for μ. M = 50 n = 15 s_M = 3

Based on the summary data below, construct a 95% confidence interval forμ. M = 25 n = 12 SS = 200

To determine the point estimate of a population parameter, use

For a one-sample t test, the point estimate would be

If we wanted to make a point estimate for μ₁ - μ₂, what statistic would we use?

If we wanted to estimate an 80% confidence interval for a two-sample repeated measures t test with a sample size of n = 23, what t values would we use?

Given the scores 10, 12, 15, and 20, what is the point estimate for μ?

If we want to establish a 99% confidence interval for the population mean, then our interval would fail to capture μ _____ percent of the time.

If we have established a 99% confidence interval for μ of 40 to 60, what would be the correct interpretation?

What is the relationship between level of confidence and the width of the confidence interval?

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Measures of Variability

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

One-Sample T-Test

Two-Sample T-Test: Independent Samples Design

Two-Sample T-Test: Related Samples Design

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters

Exam 12: Confidence Interval Versus Point Estimation

When the level of confidence is increased, the range of values ______ and becomes ________ specific.

Based on the summary data below, construct a 98% confidence interval for μD. MD = 8 n = 24 SSD = 893

Which is the correct formula for the upper limit of a confidence interval for a one-sample t test?

Point estimates involve _______ values and are _______ specific than confidence intervals.

As compared to point estimates, confidence intervals are

For an independent samples t test, the point estimate would be

Which of the following components is not needed for calculating the lower and upper limits of a confidence interval?

The scores before a treatment intervention were 10, 8, 11, 9, and 8. The scores after the intervention were 6, 5, 6, 3, and 5, respectively. What is the point estimate for μD?

Which of the following is NOT true of confidence intervals?

Based on the summary data below, construct a 90% confidence interval for μ. M = 50 n = 15 sM = 3

Based on the summary data below, construct a 95% confidence interval forμ. M = 25 n = 12 SS = 200

To determine the point estimate of a population parameter, use

For a one-sample t test, the point estimate would be

If we wanted to make a point estimate for μ₁ - μ₂, what statistic would we use?

If we wanted to estimate an 80% confidence interval for a two-sample repeated measures t test with a sample size of n = 23, what t values would we use?

Given the scores 10, 12, 15, and 20, what is the point estimate for μ?

If we want to establish a 99% confidence interval for the population mean, then our interval would fail to capture μ _____ percent of the time.

If we have established a 99% confidence interval for μ of 40 to 60, what would be the correct interpretation?

What is the relationship between level of confidence and the width of the confidence interval?

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Measures of Variability

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

One-Sample T-Test

Two-Sample T-Test: Independent Samples Design

Two-Sample T-Test: Related Samples Design

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters

When the level of confidence is increased, the range of values and becomes __ specific.

Based on the summary data below, construct a 98% confidence interval for μ_D. M_D = 8 n = 24 SS_D = 893

Point estimates involve _ values and are _ specific than confidence intervals.

The scores before a treatment intervention were 10, 8, 11, 9, and 8. The scores after the intervention were 6, 5, 6, 3, and 5, respectively. What is the point estimate for μ_D?

Based on the summary data below, construct a 90% confidence interval for μ. M = 50 n = 15 s_M = 3