A fundraiser for a political party believes that for every letter mailed, the average contribution is $9. To test her claim she randomly checks on 100 letters that were mailed and found an average of $7 and a standard deviation of $3. a. Perform a test of hypothesis at a 95% confidence level. Use the p-value method and a left tailed test. b. Perform a test of hypothesis at a 90% confidence level. Use the critical value method and a two tailed tes

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