1. In order to determine the effect of school size on subsequent academic perfor
ID: 3312521 • Letter: 1
Question
1. In order to determine the effect of school size on subsequent academic performance, 20 graduating seniors who had gone on to college were chosen from each of four high schools that had graduating classes of 50, 250, 500, and 2000. Mean college grade points were calculated for each high school, a was set at .05, and an ANOVA was run, producing an F = 2.75. From this you can conclude that
a. H0 should be rejected;
b. H0 should be retained;
c. more information is needed in order to decide about the null hypothesis, namely
2. If the F value obtained from the data is .001 and df = 2,25, you should
.3.Big Bird analyzed a set of data and got an F value of less than 1.00. Big Bird should (hint: this is a "thinking" questions based upon the formula and eyeballing the critical values.)
d. none of the other alternatives are correct.
4. Tukey Honestly Significant Difference test is a(n) ____ test.
a. reject the null hypothesis;Explanation / Answer
Q 1) For F test ,
No of classes = k =4
Total number of students selected = n= 20*4 = 80
df for numerator is = k -1 = 3 and for denominator it is = n - k = 80-4 = 76
Critical value of F is F(3,76) = 2.7249
Since F calculated is greater than F tabulated, we reject H0,
Answer: a. H0 should be rejected;
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