Last rating period, the percentages of viewers watching several channels between 11P.M. and 11: 30P.M. in a

Question:

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

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

a. Show that it is appropriate to carry out a chi-square test using these data.
b. Test to determine whether the viewing shares in the current rating period differ from those in the last rating period at the .10 level of significance. What do you conclude?