Question

researcher wanted to study the effects of a new exercise training intervention on balance. She wanted to know as a baseline what the average balance of her patients was relative to the general population. She used a standardized balance test which has a population mean of 10 sec and population standard deviation of 12 sec. 30 patients in her study were found to have an average of 15 sec on the balance test. Using an alpha level = 0.05 and a two-tailed test, which of the following statements is true? Test statistic = 2.28 and fail to reject the null hypothesis Test statistic = 2.28 and reject the null hypothesis Test statistic = -2.28 and reject the null hypothesis Test statistic = 2.19 and reject the null hypothesis

          researcher wanted to study the effects of a new exercise
training intervention on balance. She wanted to know as a baseline
what the average balance of her patients was relative to the
general population. She used a standardized balance test which has
a population mean of 10 sec and population standard deviation of 12
sec. 30 patients in her study were found to have an average of 15
sec on the balance test. Using an alpha level = 0.05 and a
two-tailed test, which of the following statements is true?
Test statistic = 2.28 and fail to reject the null hypothesis
Test statistic = 2.28 and reject the null hypothesis
Test statistic = -2.28 and reject the null hypothesis
Test statistic = 2.19 and reject the null hypothesis

Added by Joseph K.

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