The population standard deviation for the heights of dogs, in inches, in a city is4.3

inches. If we want to be80%

confident that the sample mean is within1

inch of the true population mean, what is the minimum sample size that can be taken?

z

0.10

z

0.05

z

0.04

z

0.025

z

0.01

z

0.005

1.282

1.645

1.751

1.960

2.326

2.576

Use the table above for thez

-score, and be sure to round up to the nearest integer.