The cost of a daily newspaper varies from city to city. However, the variation among prices remains steady with a standard

Question

The cost of a daily newspaper varies from city to
city. However, the variation among prices remains
steady with a standard deviation of 20¢. A study
was done to test the claim that the mean cost of a
daily newspaper is $1.00. Twelve costs yield a
mean cost of 95¢ with a standard deviation of
18¢. Do the data support the claim at the 1%
level?

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