Question

In a random sample of

88

people, the mean commute time to work was

36.536.5

minutes and the standard deviation was

7.27.2

minutes. A

9898%

confidence interval using the t-distribution was calculated to be

left parenthesis 28.9 comma 44.1 right parenthesis(28.9,44.1).

After researching commute times to work, it was found that the population standard deviation is

8.78.7

minutes. Find the margin of error and construct a

9898%

confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.

The margin of error of

muμ

is

nothing.

(Round to two decimal places as needed.)

There is two more parts to this question that I cannot view yet.

Answer #1

given data are:-

*z critical value
for 98% confidence level, both tailed test be:-*

**the margin of
error be:-**

**the 98%
confidence interval be:-**

*** if you have any doubt regarding the problem ,please write it
in the comment box...if satisfied,please
**UPVOTE.**

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