Imagine a class of twenty-five 12-year-old girls with an average height of 59.8 inches. We know that the population mean and standard deviation for this age group of girls is inches, s = 1.1 inches. (Note that this is a z-statistic problem.)
5a) Calculate the z-statistic for this sample (not the z score). Answer
5b) How does this sample mean compare to the distribution of sample means? In other words, how does the height of the girls in the sample compare to the height of girls in the general population? Answer
For the following scenarios, identify whether the researcher has expressed a directional or a nondirectional hypothesis:
6a) A researcher hypothesizes that teenagers living in urban areas who use public transportation have better spatial memory than teenagers living in suburban areas whose parents drive them to destinations.
6b) A professor wonders whether students who attend office hours score differently on exams than those who do not attend office hours.
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