. A prison psychologist recorded the number of rule infractions for 1
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. A prison psychologist recorded the number of rule infractions for 15 prison inmates over a six-month period to be 5, 4, 2, 4, 3, 5, 2, 0, 4, 4, 5, 5, 3, 4, and 3.
Make a frequency table.
Make a histogram based on the frequency table.
Describe in words the shape of the histogram.
2. Identify and solve this problem by hand.
The head of public safety notices that the average driving speed at a particular intersection averages u03bc = 35 mph with a standard deviation of u03c3 = 7.5 mph. After a school speed limit sign of 20 mph is placed at the intersection, the first 40 cars travel past at an average speed of 32 mph. Using the .01 significance level, was there a significant change in driving speed?
Sketch the distributions involved.
Figure the confidence limits for the 99% confidence interval.
3. A social psychologist gave a questionnaire about concern for farm workers to seven participants before and after they attended a film about union organization of farm workers. The results are shown below with high scores meaning high concern. Using the .05 significance level, do these results support the hypothesis that the film affected concern for the lives of farm workers?
Scores on the Concern Measure
Participant Before After
Au00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 17u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 20
Bu00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 7u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 4
Cu00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 10u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 11
Du00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 u00a0u00a0u00a013u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 15
Eu00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 8u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 5
Fu00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 9u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 8
Gu00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0u00a0 11u00a0u00a0u00a0u00a0u00a0u00a0 14
Use the five steps of hypothesis testing.
Figure the effect size and find the approximate power of this study.
4. A team of cognitive psychologists studying the effects of sleep deprivation on short-term memory decay had eight participants stay in a sleep lab for two days. Four participants were randomly assigned to a condition in which they were not permitted to sleep during that period, while the other four participants were allowed to sleep when they wanted to. At the end of the two days, the participants c
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