Mathematics

Phoenix Lynn

10 December, 14:31

According to an article in Marketing News, fewer checks are being written at the grocery store checkout than in the past. To determine whether there is a difference in the proportion of shoppers who pay by check among three consecutive years at a 0.05 level of significance, the results of a survey of 500 shoppers in three consecutive years are obtained and presented below.

Year

Check Written Year 1 Year 2 Year 3

Yes 225 175 125

No 275 325 375

Referring to the above table, what is the expected number of shoppers who pay by check in year 1, if there is no difference in the proportion of shoppers who pay by check among the three years?

Select one:

a. 150

b. 187.5

c. 175

d. 225