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Suppose the weights, in pounds, of the dogs in a city are normally distributed. If the population standard deviation is3 pounds, what minimum sample size

Suppose the weights, in pounds, of the dogs in a city are normally distributed. If the population standard deviation is3

pounds, what minimum sample size is needed to be95%

confident that the sample mean is within1

pound of the true population mean?

z

0.10

1.282

z

0.05

1.645

z

0.025

1.960

z

0.01

2.326

z

0.005

2.576

Use the table above for thez

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

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