The number of square feet per house is normally distributed with a population standard deviation of 154 square feet and an unknown population mean. If a random sample of 16 houses is taken and results in a sample mean of 1550 square feet, find a 80% confidence interval for the population mean. Round your answer to TWO decimal places.

(1500.66,1599.34)

Step-by-step explanation:

Confidence interval for population mean:

,where = Sample mean , n= Sample size, z* = critical two tailed z-value , = population standard deviation.

As per given , we have

n= 16

square feet

square feet

Critical z-value =

Confidence interval for population mean:

Required confidence interval:  (1500.66,1599.34)

is only a line? i think so