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# 1.Given a level of confidence of 95% and a population standard

### Customer Question

1.Given a level of confidence of 95% and a population standard deviation of 14, answer the following:
(A) What other information is necessary to find the sample size (n)?
(B) Find the Maximum Error of Estimate (E) if n = 80.

2.consider a population with µ= 89.8 and ό =4.48
A. Calculate the z-score for xbar91.4 from a sample of size 14 (B)could this z score be used in calculating probabilities Why or why not?

3.A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 95% confident that her estimate is correct. If the standard deviation is 4.65, how large a sample is needed to get the desired information to be accurate within 0.58 decibels? Show all work.
Submitted: 5 years ago.
Category: Homework
Expert:  Sandhya replied 5 years ago.