Question

A sample of n=9 individuals is selected from a population with a mean of μ=10. A researcher suspects that after the individuals have gone through a specific type of treatment, their performances on a standardized examination will be different from the general population. After the treatment, the sample has a M=13 and s2=9.

1. Using symbols, state the hypothesis for a two-tailed test.

2. Calculate the t statistic and place this on a standardized normal distribution.

3. With a two-tail α=0.05, state the conclusion of these findings.

4. Calculate the estimated d and state the effect size (i.e., small, medium, large).

Answer 1

Answer:

a] Null Hypothesis H0:

Alternative Hypothesis Ha:

b] Test Statistic  t

C]     By using the P value table.

Since  P value smaller than level of significans therefore significant.

DECISION: Reject Null  Hypothesis H0.

CONCLUSION: We have sufficient evidenceto conclude that the population mean is different than 10.

D] EFFECT SIZE = Large

EFFECT SIZE IS LARGE.

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