"quantity"exercise:Confidence level

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來源: 正保會(huì)計(jì)網(wǎng)校編輯：小鞠橘桔 2020/12/18 10:33:20　字體：大小

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Questions 1:

An increase in which of the following items will most likely result in a wider confidence interval for the population mean?

A、 Reliability factor

B 、Sample size

C 、Degrees of freedom

Questions 2:

The following ten observations are a sample drawn from an approximately normal population:

quantity exercise:Confidence level

The sample standard deviation is closest to:

A 、17.56.

B、 19.59.

C、 18.58.

View answer resolution

【Answer to question 1】A

【analysis】

A is correct. An increase in the reliability factor (the degree of confidence) increases the width of the confidence interval. Increasing the sample size and increasing the degrees of freedom both shrink the confidence interval. B is incorrect. Increasing the sample size shrinks the confidence interval. C is incorrect. Increasing the degrees of freedom shrinks the confidence interval.

【Answer to question 2】B

【analysis】

B is correct.

quantity exercise:Confidence leve

The sample standard deviation is the (positive) square root of the sample variance:

quantity exercise:Confidence leve

A is incorrect. 17.56 is the sum of the absolute value of the deviations from mean divided by 9:

quantity exercise:Confidence leve

C is incorrect and is calculated by dividing the sum of squared deviations by 10 rather than 9: 3,453.60/10 = 18.58.

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