Questions from Statistics

Q: You manage a small ice cream shop in which employees scoop the

You manage a small ice cream shop in which employees scoop the ice cream by hand. Each night, you total the day’s sales and the total volume of ice cream sold. You find that on nights when an employee...

Q: The book Investments, by Zvi Bodie, Alex Kane, and

The book Investments, by Zvi Bodie, Alex Kane, and Alan Marcus, claims that the annual percentage returns for investment portfolios with a single stock have a standard deviation of 0.55, while the ann...

Q: For the past 100 years, the mean batting average of major

For the past 100 years, the mean batting average of major league baseball players has remained fairly constant at about 0.260. However, the standard deviation of batting averages has decreased from ab...

Q: Consider two grocery stores at which the mean waiting time in line

Consider two grocery stores at which the mean waiting time in line is the same but the variation of waiting times is different. At which store would you expect the customers to have more complaints ab...

Q: Briefly distinguish between the following measures of variation: range, five

Briefly distinguish between the following measures of variation: range, five-number summary, and standard deviation. Which one(s) can be represented with a boxplot?

Q: I used a contour map to show the ages of full-

I used a contour map to show the ages of full-time students at my college.

Q: Briefly describe how you find quartiles and percentiles for a data set

Briefly describe how you find quartiles and percentiles for a data set.

Q: After being tested for the presence of a disease, a patient

After being tested for the presence of a disease, a patient is told to think positively, so the patient is hoping for a positive test result.

Q: When taking a test for pregnancy, a true negative result is

When taking a test for pregnancy, a true negative result is the same as a true positive result.

Q: The table below shows the batting records of two baseball players in

The table below shows the batting records of two baseball players in the first half (first 81 games) and second half of a season. Who had the higher batting average in the first half of the season? Wh...