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It has become more common for shoppers to​ “comparison shop” using the Internet. Respondents to a survey in 2013 who owned cell phones were asked whether they​ had, in the past 30​ days, looked up the price of a product while they were in a store to see if they could get a better price somewhere else. Here is a table of their responses by income level. Complete parts​ a) and​ b) below.

DATA TABLE

_         <$30K  $30K-$49.9K    $50K-$74.9K    >$75K

Yes     164      92        150      162

No       742      426      246      442

a)    

Compute the χ2 statistic.

χ2equals=

(Round to two decimal places as​ needed.)

​b) Calculate and examine the standardized residuals. What​ pattern, if​ any, do they show that would be of interest to retailers concerned about cybershopping​ comparisons? Complete the table below.

 <$30    $30-$49.9  $49.9-$74.9 

Yes

No

​(Round to five decimal places as​ needed.)

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