Edit View History Bookmarks Window Help Sun 15:10 Random samples of people ages

Question

Edit View History Bookmarks Window Help Sun 15:10 Random samples of people ages 15-24 and of people ages 25-34 were asked about their preferred method of (remote) communication with friends. The respondents were asked to select one of the methods from the following sti cell phone, instant message, e-mail, others Preferred Communication Method Cell Phone Instant Message Email other Row Total Make a cluster bar graph showing the percentages in each age group who selected each method. an the graphs, cyan represents ages 15-24, gray represents ages 2s 34) and MacBook Air

Explanation / Answer

H0: same proportion of preference

Ha: diferent proportion of preference

test statistric =11.242

yes expected frequency>5

chi square

degree of freedom =3

p value =0.0105

Observed O cell phone instant message email other Total 15-24 50 36 6 8 100 25-34 33 34 15 18 100 Total 83 70 21 26 200 Expected E=rowtotal*column total/grand total cell phone instant message email other Total 15-24 41.500 35.000 10.500 13.000 100 25-34 41.500 35.000 10.500 13.000 100 Total 83 70 21 26 200 chi square =(O-E)^2/E cell phone instant message email other Total 15-24 1.741 0.029 1.929 1.923 5.621 25-34 1.741 0.029 1.929 1.923 5.621 Total 3.482 0.057 3.857 3.846 11.242

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