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Suppose that the sample means and variances are X‾1 = 15, X‾2 = 12, s21 = 8, s22 = 24 with sample sizes n1 = 20 and n2 = 10.
Verify that s2p = 13.14, T = 2.14 and that Student's t-test rejects the hypothesis of equal means with α = .05.
a. At 95% confidence, compute the margin of error. b. Determine a 95% confidence interval for the weight of the population of bags of sugar produced by the company.
Quadro Corporation has two supermarket stores in a city. The company's quality control department wanted to check if the customers are equally satisfied with the service provided at these two stores.
Soames could pay a movie industry expert $5,000 for an evaluation of the project's success. He believes that the expert's conclusions are true 90% of the time. What should Soames do?
waiters at finegolds restaurant and lounge earn most of their income from tips. each waiter is required to tip-out a
Assume that we will randomly select a sample of 64 measurements from a population having a mean equal to 20 and a standard deviation equal to 4.
The height of 10 plants is measured in inches and found to be 12, 6, 15, 3, 12, 6, 21, 15, 18 and 12. Verify that Σ(Xi – X) = 0.- For the data in the previous problem, compute the range, variance and standard deviation.
a study was recently conducted at a major university to determine whether there is a difference in the proportion of
A plane carries 100 passengers. It can handle 3000 kg of checked baggage, that is, a maximum of 30 kg per passenger. What is the probability that a random load of 100 passengers will check too much baggage for the plane to handle?
a bridge hand consisting of 13 cards is selected at random from an ordinary deck of cards. let h d c and s be the
Find the probability that in a given winter month fewer than 35 cars will be rented. (use the normal distribution to approximate the binomal distribution).
While purchasing a home, location is everything. As a buyer, one should be aware of the cost of living in the area of choice, as well as expect a higher cost the closer to the center of town you get.
True mean when using a confidence interval of 95%. The standard deviation is estimated at $25. How many lunch receipts must they sample?
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