Question 1

You randomly draw a sample of n = 20 from a population. The sample has a mean of 10. What is the point estimate of F1F1F1S1F1F1F10?

Accepted Answer

A)  20 
B)  10 
C)  0.5 
D)  impossible to determine 
A)  20 
B)  10 
C)  0.5 
D)  impossible to determine

Question 2

If you want to calculate a 99% confidence interval when n = 22, the value for t should 2.819.

Accepted Answer

A) True 
 B)False

Question 3

If you are computing a 95% confidence interval when the population standard deviation is known, you should use 1.645 as your critical z.

Accepted Answer

A) True 
 B)False

Question 4

A range of values in which we'd expect sample statistics to fall given a particular sample size, particular parameter, and particular confidence level, would be considered a ______.

Accepted Answer

A)  point estimate 
B)  confidence interval 
C)  confidence estimate 
D)  point interval 
A)  point estimate 
B)  confidence interval 
C)  confidence estimate 
D)  point interval

Question 5

You should use a 100% confidence level when ______.

Accepted Answer

A)  you want to provide the most conservative estimate of the parameter 
B)  you want to provide the most representative estimate of the parameter 
C)  you want to provide the most accurate estimate of the parameter 
D)  none of these; never 
A)  you want to provide the most conservative estimate of the parameter 
B)  you want to provide the most representative estimate of the parameter 
C)  you want to provide the most accurate estimate of the parameter 
D)  none of these; never

Question 6

Why is it incorrect to make the following claim? "There is a 95% chance that the population mean falls between the lower and upper bounds of this confidence interval". What is the correct claim?

Accepted Answer

The population mean either is or is not

Question 7

Why do you need a different formula when calculating a confidence interval for a sample with an unknown standard deviation than for a sample with a known standard deviation?

Accepted Answer

When the population standard deviation i

Question 8

You calculate a 95% confidence interval with bounds 2.5 and 7. Which of these is an appropriate way to state that confidence interval?

Accepted Answer

A)  CI95 = [7.0, 2.5] 
B)  CI95 = [2.5, 7.0] 
C)  CI95 = (7.0, 2.5) 
D)  CI95 = (2.5, 7.0) 
A)  CI95 = [7.0, 2.5] 
B)  CI95 = [2.5, 7.0] 
C)  CI95 = (7.0, 2.5) 
D)  CI95 = (2.5, 7.0)

Question 9

You randomly draw a sample of n = 12 where F1F1F1S1F1F1F10F1F1F1S1F1F1F10 = 40. If the sample mean is 5, which of the following are the bounds of a 99% confidence interval?

Accepted Answer

A)  -24.73, 34.73 
B)  0.30, 9.70 
C)  1.42, 8.58 
D)  -17.63, 27.63 
A)  -24.73, 34.73 
B)  0.30, 9.70 
C)  1.42, 8.58 
D)  -17.63, 27.63

Question 10

You randomly select a sample of n = 30 with a mean of 6 and a standard deviation of 10.71. Determine the 95% margin of error.

Accepted Answer

A)  33% 
B)  50% 
C)  67% 
D)  95% 
A)  33% 
B)  50% 
C)  67% 
D)  95%

Question 11

If you compute an interval with a 99% confidence level, this means that 99% of sample means drawn from the population will be ______.

Accepted Answer

A)  important 
B)  accurate 
C)  between the bounds 
D)  greater than zero 
A)  important 
B)  accurate 
C)  between the bounds 
D)  greater than zero

Question 12

You randomly draw a sample of 50 organizations from a population of organizations where x̄ = 75. What is the point estimate of F1F1F1S1F1F1F10?

Accepted Answer

A)  1.25 
B)  50 
C)  75 
D)  impossible to determine 
A)  1.25 
B)  50 
C)  75 
D)  impossible to determine

Question 13

An advantage to using interval estimates instead of point estimates is ______.

Accepted Answer

A)  interval estimates provide more information than point estimates 
B)  interval estimates are easier to calculate than point estimates 
C)  interval estimates are easier to interpret that point estimates 
D)  all of these 
A)  interval estimates provide more information than point estimates 
B)  interval estimates are easier to calculate than point estimates 
C)  interval estimates are easier to interpret that point estimates 
D)  all of these

Question 14

If your 95% confidence interval bounds are 2 and 7, it is appropriate to conclude that there is a 95% chance that the population mean will be between 2 and 7.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is an example of a point estimate for F1F1F1S1F1F1F10?

Accepted Answer

A)  x̄ 
B)  x̄ - F1F1F1S1F1F1F10 
C)  Sx̄ 
D)  none of these 
A)  x̄ 
B)  x̄ - F1F1F1S1F1F1F10 
C)  Sx̄ 
D)  none of these

Question 16

In order to calculate the boundaries of a confidence interval, you must know ______.

Accepted Answer

A)  the sample size 
B)  a point estimate 
C)  confidence level 
D)  all of these 
A)  the sample size 
B)  a point estimate 
C)  confidence level 
D)  all of these

Question 17

You randomly draw a sample of n = 8 where F1F1F1S1F1F1F10 = 8. If the sample mean is -10, which of the following are the bounds of a 99% confidence interval?

Accepted Answer

A)  -15.54, -4.46 
B)  -11.96, -8.04 
C)  -12.58, -7.42 
D)  -17.28, -2.72 
A)  -15.54, -4.46 
B)  -11.96, -8.04 
C)  -12.58, -7.42 
D)  -17.28, -2.72

Question 18

F1F1F1S1F1F1F10 is a point estimate of s.

Accepted Answer

A) True 
 B)False

Question 19

You randomly select a sample of n = 21. What is the appropriate value for t to compute a 95% confidence interval?

Accepted Answer

A)  1.721 
B)  2.080 
C)  2.086 
D)  1.725 
A)  1.721 
B)  2.080 
C)  2.086 
D)  1.725

Question 20

You randomly select a sample of n = 12. What is the appropriate value for t to compute a 99% confidence interval?

Accepted Answer

A)  2.681 
B)  2.718 
C)  3.055 
D)  3.106 
A)  2.681 
B)  2.718 
C)  3.055 
D)  3.106

You randomly draw a sample of n = 20 from a population. The sample has a mean of 10. What is the point estimate of ?

If you want to calculate a 99% confidence interval when n = 22, the value for t should 2.819.

If you are computing a 95% confidence interval when the population standard deviation is known, you should use 1.645 as your critical z.

A range of values in which we'd expect sample statistics to fall given a particular sample size, particular parameter, and particular confidence level, would be considered a ______.

You should use a 100% confidence level when ______.

Why is it incorrect to make the following claim? "There is a 95% chance that the population mean falls between the lower and upper bounds of this confidence interval". What is the correct claim?

Why do you need a different formula when calculating a confidence interval for a sample with an unknown standard deviation than for a sample with a known standard deviation?

You calculate a 95% confidence interval with bounds 2.5 and 7. Which of these is an appropriate way to state that confidence interval?

You randomly draw a sample of n = 12 where ^ = 40. If the sample mean is 5, which of the following are the bounds of a 99% confidence interval?

You randomly select a sample of n = 30 with a mean of 6 and a standard deviation of 10.71. Determine the 95% margin of error.

If you compute an interval with a 99% confidence level, this means that 99% of sample means drawn from the population will be ______.

You randomly draw a sample of 50 organizations from a population of organizations where x̄ = 75. What is the point estimate of ?

An advantage to using interval estimates instead of point estimates is ______.

If your 95% confidence interval bounds are 2 and 7, it is appropriate to conclude that there is a 95% chance that the population mean will be between 2 and 7.

Which of the following is an example of a point estimate for ?

In order to calculate the boundaries of a confidence interval, you must know ______.

You randomly draw a sample of n = 8 where  = 8. If the sample mean is -10, which of the following are the bounds of a 99% confidence interval?

 is a point estimate of s.

You randomly select a sample of n = 21. What is the appropriate value for t to compute a 95% confidence interval?

You randomly select a sample of n = 12. What is the appropriate value for t to compute a 99% confidence interval?

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Probability Distributions

Sampling Distributions

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

Exam 6: Estimation and Confidence Intervals

You randomly draw a sample of n = 20 from a population. The sample has a mean of 10. What is the point estimate of ?

If you want to calculate a 99% confidence interval when n = 22, the value for t should 2.819.

If you are computing a 95% confidence interval when the population standard deviation is known, you should use 1.645 as your critical z.

A range of values in which we'd expect sample statistics to fall given a particular sample size, particular parameter, and particular confidence level, would be considered a ______.

You should use a 100% confidence level when ______.

Why is it incorrect to make the following claim? "There is a 95% chance that the population mean falls between the lower and upper bounds of this confidence interval". What is the correct claim?

Why do you need a different formula when calculating a confidence interval for a sample with an unknown standard deviation than for a sample with a known standard deviation?

You calculate a 95% confidence interval with bounds 2.5 and 7. Which of these is an appropriate way to state that confidence interval?

You randomly draw a sample of n = 12 where  = 40. If the sample mean is 5, which of the following are the bounds of a 99% confidence interval?

You randomly select a sample of n = 30 with a mean of 6 and a standard deviation of 10.71. Determine the 95% margin of error.

If you compute an interval with a 99% confidence level, this means that 99% of sample means drawn from the population will be ______.

You randomly draw a sample of 50 organizations from a population of organizations where x̄ = 75. What is the point estimate of ?

An advantage to using interval estimates instead of point estimates is ______.

If your 95% confidence interval bounds are 2 and 7, it is appropriate to conclude that there is a 95% chance that the population mean will be between 2 and 7.

Which of the following is an example of a point estimate for ?

In order to calculate the boundaries of a confidence interval, you must know ______.

You randomly draw a sample of n = 8 where  = 8. If the sample mean is -10, which of the following are the bounds of a 99% confidence interval?

 is a point estimate of s.

You randomly select a sample of n = 21. What is the appropriate value for t to compute a 95% confidence interval?

You randomly select a sample of n = 12. What is the appropriate value for t to compute a 99% confidence interval?

The Language of Statistics

Working With Numbers and Data Display

Central Tendency and Variability

Probability Distributions

Sampling Distributions

Hypothesis Testing

Tests for Significance: Z-Tests and One-Sample T-Tests

Tests for Significance: Paired and Independent-Samples T-Test

Analysis of Variance Anova

CHI-Squared Tests of Fit

Correlation R and Regression Y BX A

Matching Statistical Tests to Business Problems

Filters

You randomly draw a sample of n = 12 where ^ = 40. If the sample mean is 5, which of the following are the bounds of a 99% confidence interval?