Questions from Applied Statistics

Q: Are the following statements true or false? Explain your reasoning.

Are the following statements true or false? Explain your reasoning. a. “If we see a standardized z-value beyond 63, the variable cannot be normally distributed.” b. “If X and Y are two normally distr...

Q: John can take either of two routes (A or B)

John can take either of two routes (A or B) to LAX airport. At midday on a typical Wednesday the travel time on either route is normally distributed with parameters μA = 54 minutes, σA = 6 minutes, μB...

Q: In a sample of 100 Planter’s Mixed Nuts, 19 were found

In a sample of 100 Planter’s Mixed Nuts, 19 were found to be almonds. (a) Construct a 90 percent confidence interval for the true proportion of almonds. (b) May normality be assumed? Explain. (c) What...

Q: Discuss why you would or would not expect each of the following

Discuss why you would or would not expect each of the following variables to be normally distributed. Hint: Would you expect a single central mode and tapering tails? Would the distribution be roughly...

Q: (a) Check whether the binomial approximation is acceptable in each

(a) Check whether the binomial approximation is acceptable in each of the following hypergeometric situations. (b) Find the binomial approximation (using Appendix A) for each probability requested. (c...

Q: Why might the following not be normally distributed? (a)

Why might the following not be normally distributed? (a) The time it takes you to drive to the airport. (b) The annual income for a randomly chosen Major League Baseball player. (c) The annual hurrica...

Q: Write the Excel binomial formula for each probability. a

Write the Excel binomial formula for each probability. a. Three successes in 20 trials with a 30 percent chance of success. b. Seven successes in 50 trials with a 10 percent chance of success. c. Six...

Q: Scores on a certain accounting exam were normally distributed with a mean

Scores on a certain accounting exam were normally distributed with a mean of 75 and a standard deviation of 7. Find the percentile for each individual using Excel’s =NORM.S.DIST function. (a) Bob’s sc...

Q: A random sample of 30 lunch orders at Noodles and Company showed

A random sample of 30 lunch orders at Noodles and Company showed a standard deviation of $5.31. Find the 90 percent confidence interval for the population standard deviation. Use Excel to obtain X2L =...

Q: Experience indicates that 8 percent of the pairs of men’s trousers dropped

Experience indicates that 8 percent of the pairs of men’s trousers dropped off for dry cleaning will have an object in the pocket that should be removed before cleaning. Suppose that 14 pairs of pants...