Infer Stats in Decision-Making

Over the past decade, ABC Manufacturing has increased the number of safety inspections per month in hopes to decrease the number accidents on their production line.  Below is a list of how many inspections were conducted in a month and the corresponding number of accidents recorded.  Is there a correlation, and has this leadership decision been effective?

Inspections	Accidents
20	181
24	190
28	167
40	160
60	120
64	124
64	118
68	90
70	94
72	85

A marketing team conducted a survey of 300 people to see if a person’s age affected their brand choice.  People under the age of twenty-five made the following choices: Brand A (25), Brand B (42), Brand C (33).  People over 65 made the following selections: Brand A (20), Brand B (38), Brand C (42).  The group between those ages made these choices: Brand A (44), Brand B(40), Brand C (16).  Form your  hypotheses, run the appropriate test, and provide a conclusion to the marketing team. 

Two schedules for giving rest were compared—the massed schedule and the spaced schedule. Twenty observations of the spaced schedule produced a mean of 26 errors. On the massed schedule 14 observations resulted in a mean of 36 errors. An α level of .05 was adopted and an F = 4.21 was obtained. What conclusion is appropriate?

		· spaced practice produces fewer errors than massed practice.
		· none of the choices are correct
		· the null hypothesis should be retained
		· massed practice produces fewer errors than spaced practice

With an acknowledgment to Sesame Street, "Which of these things is not like the others, which of these things doesn't belong?"

		· matched pairs
		· independent samples
		· natural pairs
		· repeated measures