Questions from Statistics Principles

Q: Jessica enrolled in a course that promised to increase her reading speed

Jessica enrolled in a course that promised to increase her reading speed. To help judge the effectiveness of the course, Jessica measured the number of words per minute she could read prior to enrolli...

Q: The following data represent the age of U.S. presidents

The following data represent the age of U.S. presidents on their respective inauguration days (through Donald Trump). (a) Find the five-number summary. (b) Construct a boxplot. (c) Comment on the shap...

Q: The following data represent the percentage of workers who carpool to work

The following data represent the percentage of workers who carpool to work for the 50 states plus Washington, D.C. Note: The minimum observation of 7.2% corresponds to Maine and the maximum observatio...

Q: The data below represent the age of the mother at the time

The data below represent the age of the mother at the time of her first birth for a random sample of 30 mothers. (a) Construct a boxplot of the data. (b) Use the boxplot and quartiles to describe the...

Q: The following data represent the weight (in grams) of a

The following data represent the weight (in grams) of a random sample of 25 Tylenol tablets. (a) Construct a boxplot. (b) Use the boxplot and quartiles to describe the shape of the distribution.

Q: In Problem 25 from Section 3.1, we drew a

In Problem 25 from Section 3.1, we drew a histogram of the weights of M&Ms and found that the distribution is symmetric. Draw a boxplot of these data. Use the boxplot and quartiles to confirm the dist...

Q: In Problem 26 from Section 3.1, we drew a

In Problem 26 from Section 3.1, we drew a histogram of the length of eruption of California’s Old Faithful geyser and found that the distribution is symmetric. Draw a boxplot of these data. Use the...

Q: A student wanted to know whether Centrum vitamins dissolve faster than the

A student wanted to know whether Centrum vitamins dissolve faster than the corresponding generic brand. The student used vinegar as a proxy for stomach acid and measured the time (in minutes) it took...

Q: Ty Cobb is one of Major League Baseball’s greatest hitters of all

Ty Cobb is one of Major League Baseball’s greatest hitters of all time, with a career batting average of 0.366. Source: baseball-almanac.com

Q: Explain the difference between a population and a sample.

Explain the difference between a population and a sample.