Questions from Business Statistics

Q: A study by the University of Texas Southwestern Medical Center examined 626

A study by the University of Texas Southwestern Medical Center examined 626 people to see if an increased risk of contracting hepatitis C was associated with having a tattoo. If the subject had a tatt...

Q: Here is a display of the international load factors by month for

Here is a display of the international load factors by month for the period from 2002 to 2017: Discuss the patterns you see in this display.

Q: Here is a display of the domestic load factors by year through

Here is a display of the domestic load factors by year through 2017: Discuss the patterns you see in this display.

Q: Look at the boxplots by month in Exercise 5. The low

Look at the boxplots by month in Exercise 5. The low outlier in April is for April of 2003. At that time, there was concern over the deadly SARS virus, which may have depressed international travel. D...

Q: The boxplots of exercise 6 show a single possible outlier. But

The boxplots of exercise 6 show a single possible outlier. But that month in 2015 would not be an outlier in any of the other months in the display. Do you think it should still be considered an outli...

Q: Here is a timeplot of each monthly load factor for domestic flights

Here is a timeplot of each monthly load factor for domestic flights for 2000 to 2013 along with a lowess smooth. 1. Describe the patterns you see in this plot. 2. Do you expect the overall pattern to...

Q: The mean score on the Stats exam was 75 points with a

The mean score on the Stats exam was 75 points with a standard deviation of 5 points, and Gregor z-score was −2. How many points did he score?

Q: Some IQ tests are standardized to a Normal model, with a

Some IQ tests are standardized to a Normal model, with a mean of 100 and a standard deviation of 15. 1. Draw the model for these IQ scores. Clearly label it, showing what the 68 95 99.7 Rule predicts....

Q: One of the authors has an adopted grandson whose birth family members

One of the authors has an adopted grandson whose birth family members are very short. After examining him at his 2-year checkup, the boy pediatrician said that the z-score for his height relative to A...

Q: Suppose your statistics professor reports test grades as z-scores,

Suppose your statistics professor reports test grades as z-scores, and you got a score of 2.20 on an exam. 1. Write a sentence explaining what that means. 2. Your friend got a z-score of 1. If the gra...