Adult entrance fees to amusement parks in the United Statesare normally distributed with a population standard deviation of2.5

dollars and an unknown population mean. A random sample of22

entrance fees at different amusement parks is taken and results in a sample mean of61

dollars.

Find themargin of errorfor a99%

confidence interval for the population mean.

z

0.10

z

0.10

z

0.05

z

0.05

z

0.025

z

0.025

z

0.01

z

0.01

z

0.005

z

0.005

1.282

1.645

1.960

2.326

2.576

You may use a calculator or the commonz

values above.

• Round the final answer to twodecimal places.