You want to obtain a sample to estimate a population mean. based on previous evidence, you believe the population standard deviation is approximately σ = 34.5 . you would like to be 99% confident that your estimate is within 10 of the true population mean. how large of a sample size is required?

Required sample size is minimum 79

Step-by-step explanation:

Minimum sample size to estimate the true population mean is given by the formula:

N≥ where

z=2.58 for 99% confidence level, s= 34.5 and E=10. If we put these numbers in the formula:

N≥ =78.97 ≈ 79

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1

c is the correct answer

step-by-step explanation: