Last rating period, the percentages of viewers watching several channels between 11 p.m. and 11:30 p.m. in a major TV market were as follows:

WDUX

(News)WWTY

(News)WACO

(CheersReruns)WTJW

(News)Others13%22%22%20%23%

Suppose that in the current rating period, a survey of 2,000 viewers gives the following frequencies:

WDUX

(News)WWTY

(News)WACO

(CheersReruns)WTJW

(News)Others261403469351516

Click here for the Excel Data File

(a)Show that it is appropriate to carry out a chi-square test using these data.

(b)Determine whether the viewing shares in the current rating period differ from those in the last rating period at the .10 level of significance.(Round youranswer to 3 decimal places.)