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For the following independent random samples, use the z-test and the 0.01 level of significance in testing Ho:u1 = u2 versus H1:u1 = u2.
x1 = 33.5 s1 = 6.4 n1 = 31
x2 = 27.6 s2 = 2.7 n2 = 30
2. The manager's assistant, who created a new brochure, randomly selects 400 current customers, then randomly chooses 200 to receive the standard brochure that has been used in the past, with the other 200 receiving the promising new brochure that he has developed. Of those receiving the standard brochure, 35% call for more information about the counseling session, while 42% of those receiving the new brochure call for more information. Using the 0.10 level of significance, is it possible that the superior performance of the new brochure was just due to chance and that the new brochure might really be no better than the old one?
Find a 95% confidence interval for the mean amount of money µ spent at the waiter's tables.
State the null and alternative hypothesis if the average electric bill for residents of White Pine Estates exceeds $52.98 per month.
What is the break-even cost? What is the profit for 75 units of feed sold? How many units must be sold to produce a profit of $1020?
What is the probability that none are a commercial success?
How do we use a least squares regression line? Please explain in your own words. What is the range for the coefficient of determination? Please explain in your own words.
11% of all books sold are romance genre. If the bookstore sells 316 books on a given day, what is the probability that fewer than 40 are romances, at least 25 are romances, between 25 and 40 are romances?
A car manufacturer tests the first 1,000 cars coming off the assembly line to see if their new anti-lock braking system works correctly. Use the typical values for control limits.
By how much does the standard error of x-bar change if the sample is increased to 100?
Do not forget to test for any applicable difference in means (Tukey implies).
Based on p=.60, probability that a randomly selected homeowners will say no to newspaper subscription.
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
Find the range, standard deviation, and variance for the scores.
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