(1)

Anystate Auto Insurance Company took a random sample of376insurance claims paid out during a 1-year period. The average claim paid was$1570. Assume=$236.

Find a 0.90 confidence interval for the mean claim payment. (Round your answers to two decimal places.)

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Find a 0.99 confidence interval for the mean claim payment. (Round your answers to two decimal places.)

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(2)

Sherds of clay vessels were put together to reconstruct rim diameters of the original ceramic vessels at the Wind Mountain archaeological site. A random sample of ceramic vessels gave the following rim diameters (in centimeters).

15.9 | 13.4 | 22.1 |12.7| 13.1 | 19.6 | 11.7 | 13.5| 17.7 |18.1

USE SALT

(a) Use a calculator with mean and sample standard deviation keys to find the sample meanxand sample standard deviations. (Round your answers to four decimal places.)

_

x =__________ cm

s =___________ cm

(b) Compute a98%confidence interval for the population meanof rim diameters for such ceramic vessels found at the Wind Mountain archaeological site. (Round your answers to one decimal place.)

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