Questions from Business Statistics

Q: As in Exercise 3, for each of the following situations,

As in Exercise 3, for each of the following situations, define the parameter and write the null and alternative hypotheses in terms of parameter values. 1. Seat-belt compliance in Massachusetts was 65...

Q: Referring to the study of Exercise 1: 1. Is

Referring to the study of Exercise 1: 1. Is the alternative to the null hypothesis more naturally one-sided or two-sided? Explain. 2. The P-value from a clinical trial testing the hypothesis is 0.0028...

Q: A test preparation company claims that more than 50% of the

A test preparation company claims that more than 50% of the students who take their GRE prep course improve their scores by at least 10 points. 1. Is the alternative to the null hypothesis more natura...

Q: In the first 17 years of the 21st century, did men

In the first 17 years of the 21st century, did men and women marry at the same age? Here are boxplots of the age at first marriage for U.S. citizens then. Write a brief report discussing what these da...

Q: According to the 2010 Census, 16% of the people in

According to the 2010 Census, 16% of the people in the United States are of Hispanic or Latino origin. One county supervisor believes her county has a different proportion of Hispanic people than the...

Q: According to the 2010 Census, 11.4% of all

According to the 2010 Census, 11.4% of all housing units in the United States were vacant. A county supervisor wonders if her county is different from this. She randomly selects 850 housing units in h...

Q: Instead of advertising the percentage of customers who improve by at least

Instead of advertising the percentage of customers who improve by at least 10 points, a manager suggests testing whether the mean score improves at all. For each customer they record the difference in...

Q: Which of the following are true? If false, explain briefly

Which of the following are true? If false, explain briefly. 1. A P-value of 0.01 means that the null hypothesis is false. 2. A P-value of 0.01 means that the null hypothesis has a 0.01 chance of being...

Q: A new reading program may reduce the number of elementary school students

A new reading program may reduce the number of elementary school students who read below grade level. The company that developed this program supplied materials and teacher training for a large-scale...

Q: For each of the following situations, state whether a Type I

For each of the following situations, state whether a Type I, a Type II, or neither error has been made. Explain briefly. 1. A bank wants to know if the enrollment on their website is above 30% based...