Past experience indicates that the monthly long distance telephone bill is Past experience indicates

Past experience indicates that the monthly long distance telephone bill is

Past experience indicates that the monthly long-distance telephone bill is normally distributed with a mean of $17.85 and a standard deviation of $3.87. After an advertising campaign aimed at increasing long-distance telephone usage, a random sample of 25 household bills was taken.

a. Do the data allow us to infer at the 10% significance level that the campaign was successful?

b. What assumption must you make to answer part (a)?

Past experience indicates that the monthly long distance telephone bill is

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