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 |