Score: 0 of 1 pt 19 of 26 (22 complete) Score: 84.62%, 22 of 26 pts 6.1.39-T Que

Question

Score: 0 of 1 pt 19 of 26 (22 complete) Score: 84.62%, 22 of 26 pts 6.1.39-T Question Help * A random sample of 55 transmission replacement costs find the mean to be $2570.00. Assume the population standard deviation is $425.00. A 90% confidence interval for the population mean repair cost is (2475.7,2664.3) Change the sample size to n-110. Construct a 90% confidence interval for the population mean repair cost Which confidence interval s vider? Explain Construct a 90% confidence interval for the population mean repair cost. The 90% confidence interval is (DD (Round to one decimal place as needed.)

Explanation / Answer

The statistical software output for this problem is:

One sample Z summary confidence interval:
: Mean of population
Standard deviation = 425

90% confidence interval results:

Hence,

90% confidence interval will be:

(2503.3, 2636.7)

The confidence interval will size 55 would be wider since the margin of error decreases as we increase the sample size.

Mean n Sample Mean Std. Err. L. Limit U. Limit 110 2570 40.52216 2503.347 2636.653

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