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  3. 1.   do consumers spend more on a trip to walmar

1.   Do consumers spend more on a trip to Walmart or Target? Suppose researchers interested in...

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Basic Math


1.   Do consumers spend more on a trip to Walmart orTarget? Suppose researchers interested in this question collected asystematic sample from 85 Walmart customers and 80 Target customersby asking customers for their purchase amount as they left thestores. The data collected are summarized in the table below.
   
Walmart
Target
sample size
85
80
sample mean
$45
$53
sample std dev
$20
$18

a.   Check the conditions to create a confidenceinterval for the difference in spending at the two stores.
b.   Create a 95% confidence interval for the differencein spending at the two stores. (Note: We don’t have the full data,so you can use the formulas on page 342 or a program that doesn’trequire it.)
c.   Interpret your confidence interval with asentence.
d.   Your CI from part b does not contain zero. Does thatmean the difference in spending at the two stores is statisticallysignificant? Why or why not?

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