A cheerleading squad received a mean rating (out of 100 possible points) of739()

in competitions over the previous three seasons. The same cheerleading squad performed in16local competitions this season with a mean rating equal to75in competitions. Suppose we conduct a one-independent samplez-test to determine whether mean ratings increased this season (compared to the previous three seasons) at a 0.05 level of significance.

(a) State the value of the test statistic. (Round your answer to two decimal places.)

z=

State whether to retain or reject the null hypothesis.

Retain the null hypothesis.

Reject the null hypothesis.

(b) Compute effect size using Cohen'sd. (Round your answer to two decimal places.)

d=