The number of square feet per house are normally distributed. with population standard deviation of 137 square feet and unk. mean. Aeandom sample of 19 houses taken results in the sample mean of 1350 square feet.

Find the margin of error of 80% confidence interval for population mean.

Z0.10 Z0.05 Z0.025 Z0.005

1.282 1.645 1.960 2.576

Round to 2 decimal places