A study of the effect of television commercials on 12-year-old children measured
ID: 1092646 • Letter: A
Question
A study of the effect of television commercials on 12-year-old children measured their attention span, in seconds. The commercials were for clothes, food, and toys.
Complete the ANOVA table. Use .05 significance level. (Round the SS and MS values to 1 decimal place and F value to 2 decimal places. Leave no cells blank - be certain to enter "0" wherever required.)
Find the values of mean and standard deviation. (Round the mean and standard deviation values to 3 decimal places.)
Clothes Food Toys 34 38 64 30 34 50 44 51 39 35 42 48 28 47 63 31 42 53 17 34 48 31 43 58 20 57 47 47 51 44 51 54Explanation / Answer
A).
H0 : u1 - u2 ;
H1 : u1 is not equal to u2.
Critical value of F = 4.75
Source............SS..................df................MS.................F
Treatment........219.43...........1...................219.43.........23.10
Error................114.00............12................9.5
Total.................333.43............13
B).
(t= rac{(19-27)}{sqrt{9.5*(1/6+1/8)}} = -4.806)
Then t^2 = F. That is (-4.806)^2 = 23.10
C). H0 is rejected. There is a difference in the mean scores .
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