# Estimates and sample sizes

*label*Mathematics

*timer*Asked: Dec 15th, 2018

*account_balance_wallet*$10

**Question description**

Surveyed 4400 grad students to determine the length of tie to earn a their bachelor’s degrees. The sample mean is 5.15 years, population standard deviation is 1.68 years. Construct a 96% confidence interval for the mean time taken by college grads.

Z=2..05

1- find the margin of error

2-find the confidence interval estimate of the population mean.

3-Write a complete statement interpreting the confidence interval

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