Questions from Business Statistics

Q: Suppose that 25% of people have a dog, 29%

Suppose that 25% of people have a dog, 29% of people have a cat, and 12% of people own both. What is the probability that someone owns a dog or a cat?

Q: A national survey indicated that 30% of adults conduct their banking

A national survey indicated that 30% of adults conduct their banking online. It also found that 40% are younger than 50, and that 25% are younger than 50 and conduct their banking online. Make a proba...

Q: Suppose that the information in Exercise 9 had been presented in the

Suppose that the information in Exercise 9 had been presented in the following way. Facebook reports that 70% of its users are from outside the United States. Of the U.S. users, two-thirds log on ever...

Q: Suppose that the information in Exercise 10 had been presented in the

Suppose that the information in Exercise 10 had been presented in the following way. A national survey of bank customers finds that 40% are younger than 50. Of those younger than 50, 5 of 8 conduct th...

Q: Given the probabilities in Exercise 11, what is the probability that

Given the probabilities in Exercise 11, what is the probability that a person is from the United States given that he logs on to Facebook every day? Has the probability that he is from the United Stat...

Q: Sugar is a major ingredient in many breakfast cereals. The histogram

Sugar is a major ingredient in many breakfast cereals. The histogram displays the sugar content as a percentage of weight for 49 brands of cereal. The boxplots compare sugar content for adult and chil...

Q: Given the probabilities in Exercise 12, what is the probability that

Given the probabilities in Exercise 12, what is the probability that a person is younger than 50 given that she uses online banking? Has the probability that she is younger than 50 increased or decrea...

Q: Forty-five percent of Americans like to cook and 59%

Forty-five percent of Americans like to cook and 59% of Americans like to shop, while 23% enjoy both activities. What is the probability that a randomly selected American either enjoys cooking or shop...

Q: What is the probability that a person likes to watch football,

What is the probability that a person likes to watch football, given that she also likes to watch basketball?

Q: From Exercise 3, if someone doesn’t like to watch basketball,

From Exercise 3, if someone doesn’t like to watch basketball, what is the probability that she will be a football fan?