You\'ve decided to use an intervention program for reading skills for at risk ch

Question

You've decided to use an intervention program for reading skills for at risk children (n = 25). At the start of the year, the kids take a standardized reading test for their age group. After a year of intervention, they take a follow-up standardized test. On average there was a 3 point difference between time one and time two scores across the students. The variance for these differences is 36. Your primary objective is to determine whether your intervention improved reading test scores. a.) State your null and alternative hypotheses: b.) What type of research design is this? Circle one: Matched or Repeated Measures c). What are your degrees of freedom and critical value(s) given the alpha = .05 level? d.) Calculate your test statistic. e.) What would you conclude about the efficacy of the intervention? Write a conclusionary statement and be sure to report your results as it would appear in an APA compliant manuscript (e.g. t(df) = t_obs, p

Explanation / Answer

1)

ho: no significant difference in the means of 2 reading scores

h1: intervention has improved scores

2)

repeated measure designs

3)

df = n-1 = 24

4)

5)

p-value = P(T>=t) = P(T>=2.5) = 0.009

with t =2.5 and p-value < 0.05 (alpha), i reject ho at 5% level of significance and conclude that intervention has improved scores

t= mean_diff/(sd_diff/sqrt(n)) =3/SQRT(36/25) 2.5

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