American Greetings would like to test the hypothesis that the average amount of

Question

American Greetings would like to test the hypothesis that the average amount of money spent per person on Mother's Day increased by more than $10 this year when compared to last year. The following data represents the amount of money that the same eight individuals spent on Mother's Day during the past two holidays.

Person 1 2 3 4 5 6 7 8

Last Year $140 $113 $86 $147 $140 $162 $150 $142

This Year $133 $110 $156 $170 $160 $166 $183 $154

Define Population 1 as this year and Population 2 as last year. Construct a 90% confidence interval for the difference in population mean and interpret the results. Compute 5 steps Alpha 0.1 half alpha = 0.05

Explanation / Answer

Std Dev.2: 22.86

M1-M2=135-154=-19
sd=43.924; se=11.757
90% CI of difference:
-38.3384 <-19< 0.3384

Std Dev.2: 22.86

M1-M2=135-154=-19
sd=43.924; se=11.757
90% CI of difference:
-38.3384 <-19< 0.3384

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