|
The physical fitness score for a population of police officers at a local police station is 72, with a standard deviation of 7 on a 100-point physical endurance scale. Suppose the police chief selects a sample of 49 local police officers from this population and records a mean physical fitness rating on this scale equal to 74. He conducts a one-sample z test to determine whether physical endurance increased at a .05 level of significance.
(a) State the value of the test statistic and whether to retain or reject the null hypothesis.
(b) Compute effect size using Cohen s d. |
| New search. (Also 1294 free access solutions) |