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Last fall, a sample of n = 36 freshman was chosen to participate in the new 4-hour training program designed to improve study skills. To estimate effectiveness of the new program, sample was compared with rest of freshman class. All freshman should take same English Language Skills course, and mean score on the final exam for entire freshman class was µ = 74. Students in new program had mean score of M = 79.4 with standard deviation of s = 18.
a. On basis of these data, can college conclude that students in new program performed significantly better than rest of freshman class? Use a one-tailed test with α = .05.
b. Can college conclude that students in new program are significantly different than rest of the freshman class? Use a two-tailed test with α = .05
If sales invoices are automatically calculated and posted by a company's computer system, can the auditor reduce substantive tests of transactions for the accuracy objective? Why?
The president of Doerman Distributors, Inc., believes that 34% of the firm's orders come from first-time customers. A simple random sample of 120 orders will be used to estimate the proportion of first-time customers
In our discussions of basic probability theory the concepts of mutually exclusive events and independent events share prominent roles. Please explain these concepts and in particular address the question
The mean income of a group of sample observations is $500; the standard deviation is $40. According to Chebyshev's theorem, at least what percent of the incomes will lie between $400 and $600?
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
(A) What is the probability that none of the components will fail ??? (B) What is the probability that at least one component will fail ???
Armstrong Faber produces a standard number-two pencil called Ultra-Lite. Since Chuck Armstong started Armstrong Faber, sales have grown steadily. With the increase in the price of wood products.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
Laura wanted to build a multiple regression model based on advertising expenditures and Coffee Time's price index. Based on the selection of all normal values, she obtained the following:
Clark Heter is an industrial engineer at Lyons Products. He would like to conclude whether there are more units produced on the afternoon shift than on the day shift. A sample of 54 day-shift workers showed that the mean number of units produced w..
Given that consumer changed te brands, what is the probability that consumer purchased fewer products than before?
Indicate your hypotheses, decision rule, statistical decision and management conclusion using the critical value and then find the p-value and state your decision rule, statistical decision and management conclusion using this method.
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