a. Find a

b. Find a

UkusakazaL
2021-08-10
Answered

A firm employs 189 junior accountants. In a random sample of 50 of these, the mean number of hours overtime billed in a particular week was 9.7, and the sample standard deviation was 6.2 hours.

a. Find a$95\mathrm{\%}$ confidence interval for the mean number of hours overtime billed per junior accountant in this firm that week.

b. Find a$99\mathrm{\%}$ confidence interval for the total number of hours overtime billed by junior accountants in the firm during the week of interest.

a. Find a

b. Find a

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Answered 2021-08-16
Author has **155** answers

Given data,

The number of employee is 189.

The mean of the overtime is 9.7.

The standard deviation of overtime is 6.2

The sample size is 50.

Step 1

a) A

Error margin

The lower bound of the interval is,

The upper bound of the interval is,

Step 2

b) A

Error margin

The lower bound of the interval is,

The upper bound of the interval is,

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A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is $\sigma =15$

a) Compute the$95\mathrm{\%}$ confidence interval for the population mean. Round your answers to one decimal place.

b) Assume that the same sample mean was obtained from a sample of 120 items. Provide a$95\mathrm{\%}$ confidence interval for the population mean. Round your answers to two decimal places.

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Larger sample provides a-Select your answer-largersmallerItem 5 margin of error.

a) Compute the

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c) What is the effect of a larger sample size on the interval estimate?

Larger sample provides a-Select your answer-largersmallerItem 5 margin of error.

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