Question

QUESTION 18 1 points Save Answer For question 17, there were 15 children in each group, so the df = 28. The obtained t was 1.95. Was the effect significant? Defend your reasoning. TTT Arial 3 (12pt) TE 2 Qis Path: Words:0

Answer 1

Q 18 :

t = 1.95 and df= 28

P value at 5% level of significance is 0.061254.

The result is not significant at p < .05

We have accepted the null hypothesis

Q19:

Please provide the complete question, it is unclear what i m supposed to answer

Q 20:

We can perform the F- Test for equality of variances to test the assumption of homogeneity assumption

Definition The F hypothesis test is defined as: Ho: oỉ = ož Ha: of < for a lower one-tailed test o > oz for an upper one-tailed test o 7 oz for a two-tailed test Test F= sĩ/8% Statistic: where sî and sź and are the sample variances. The more this ratio deviates from 1, the stronger the evidence for unequal population variances. Significance a Level: Critical The hypothesis that the two variances are equal is Region: rejected if F> FQ,N,-1,N2-1 for an upper one-tailed test F<F1-a,N-1,N,–1 for a lower one-tailed test F<F1-a/2,N,-1,N,-1 for a two-tailed test

Q 21:

The other assumption of t-test is that the two samples are from normal population.

We use histograms and stem and leaf plot to detect normal population between it makes easy for us to detect the bell shaped curve of normal population