H0: s2 = 20, the test statistic is…

3. Last school year, the student body of a local university consisted of 30% freshmen; 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this student body showed the following number of students in each classification.

Freshman83

Sophomores 68

Juniors85

Seniors64

We are interested in whether or not there has been a significant change in the classifications between the last school year and this school year.

at alpha = .05, the null hypothesis ….

4. In an analysis of variance problem, if SST = 120 and SSTR = 80, then SSE is…

5. In a regression model involving 30 observations, the following estimated regression equation was obtained:

  • y Hat = 17 + 4×1 – 3×2 + 8×3 + 8×4

for this model SSR = 700 and SSE = 100

the computed F statistic for testing the significance of the above model is…