Questions from Statistics

Q: Cockroaches tend to rest in groups and prefer dark areas. In

Cockroaches tend to rest in groups and prefer dark areas. In a study by Halloy et al. published in Science Magazine in November 2007, cockroaches were introduced to a brightly lit, enclosed area with...

Q: Refer to the description in exercise 10.71. There were

Refer to the description in exercise 10.71. There were 22 trials with only cockroaches (no robots) that went under one shelter. In 16 of these 22 trials, the group chose the darker shelter, and in 6 o...

Q: In July 2013, Jeff Witmer obtained a data set from the

In July 2013, Jeff Witmer obtained a data set from the Tampa Bay Times after the Zimmerman case was decided. Zimmerman shot and killed Trayvon Martin (an unarmed black teenager) and was acquitted. The...

Q: Here are the conviction rates with the “stand your ground”

Here are the conviction rates with the “stand your ground” data mentioned in the previous exercise. “White shooter on nonwhite”...

Q: The figure shows side-by-side boxplots of the number

The figure shows side-by-side boxplots of the number of hours per week that University of California, Los Angeles (UCLA) students spent listening to music. Minitab output for ANOVA is also shown. Chec...

Q: A random sample of 25 men’s resting pulse rates shows a mean

A random sample of 25 men’s resting pulse rates shows a mean of 72 beats per minute and a standard deviation of 13. a. Find a 95% confidence interval for the population mean pulse ra...

Q: A random sample of 50 12th-grade students was asked how

A random sample of 50 12th-grade students was asked how long it took to get to school. The sample mean was 16.2 minutes, and the sample standard deviation was 12.3 minutes. (Source: AMSTAT Census at S...

Q: Three independent random samples of full-time college students were asked

Three independent random samples of full-time college students were asked how many hours per week they studied outside of class. Their responses and their majors are shown in the table. Test the hypot...

Q: Assume women’s heights are approximately Normally distributed with a mean of 65

Assume women’s heights are approximately Normally distributed with a mean of 65 inches and a standard deviation of 2.5 inches. Which of the following questions can be answered using the Central Limit...

Q: According to home-water-works.org, the average

According to home-water-works.org, the average shower in the United States lasts 8.2 minutes. Assume the standard deviation of shower times is 2 minutes and the distribution of shower times is right-s...