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


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.

E) B) and C)
F) A) and D)

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The estimation formula for the one-sample z is The estimation formula for the one-sample z is . .

A) True
B) False

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


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

E) B) and C)
F) A) and D)

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Which of the following is a characteristic of confidence intervals?


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

D) None of the above
E) B) and C)

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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?


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

E) A) and D)
F) A) and C)

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

A) True
B) False

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

A) True
B) False

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

A) True
B) False

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

A) True
B) False

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Which of the following words best describes certainty?


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

E) B) and C)
F) A) and C)

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


A) more
B) less

C) A) and B)
D) undefined

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


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.

E) A) and C)
F) A) and B)

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


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

E) All of the above
F) C) and D)

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

A) True
B) False

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

A) True
B) False

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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 ( 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) 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. ) of 0.3.What is the confidence interval at this level of confidence?


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.

E) C) and D)
F) B) and D)

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In a sample of 18 participants,a researcher estimates the 80% CI for a sample with a mean of 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? A) 6.4 B) 7.0 C) 10.6 D) 11.2 = 8.8 and an estimated standard error for the difference ( 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? A) 6.4 B) 7.0 C) 10.6 D) 11.2 ) of 1.8.What is the lower confidence limit for this interval?


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

E) B) and C)
F) All of the above

Correct Answer

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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?


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

E) A) and B)
F) A) and C)

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


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

C) A) and B)
D) undefined

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A researcher estimates the 95% CI for a sample with a mean of M = 3.26 and a standard error ( 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? A) 1.48 B) 2.35 C) 4.17 D) 5.04 ) of 0.91.What is the upper confidence limit for this interval?


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

E) A) and D)
F) A) and C)

Correct Answer

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