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Question: The mean score on a 25-point placement exam in mathematics used for the past two years at a large state university is 14.3. The placement coordinator wishes to test whether the mean score on a revised version of the exam differs from 14.3. She gives the revised exam to 30 entering freshmen early in the summer; the mean score is 14.6 with standard deviation 2.4.
a. Perform the test at the 10% level of significance using the critical value approach.
b. Compute the observed significance of the test.
c. Perform the test at the 10% level of significance using the p-value approach. You need not repeat the first three steps, already done in part (a).
Research shows women harder hit by hangovers" and the accompanying Original Source 2. In the study, 472 men and 758 women, all of whom were college students.
Find the population standard deviation using the formula containing the mean (the original formula).
Supposes that the diameter of bearings are independent normally distributed random variables with mean µB = 1.005cm and variance σ²B = (0.003)² cm² . The diameter of shafts are independent normally distributed random variables having mean µB = 0.9..
A student did some holiday shopping by buying 4 books: 1 for his father, 1 for his mother, 1 for his young sister, and 1 for his older brother.
a brewerys filling machine is adjusted to fill bottles with a mean of 31.2 oz. of ale and a variance of 0.003.
A local fast-food restaurant has determined that 10% of drive-thru orders are filled incorrectly. Suppose 5 orders are randomly selected. What is the probability that more than one of the orders is filled incorrectly?
a consumer survey is trying to assess how much bad food is being purchased. bad foods are categorized into two types
Abstract your answer to exercise 2.30 to produce a procedure tree-map with the property that square-tree could be defined as(define (square-tree tree) (tree-map square tree))
bob a manufacturing plant manager is inspecting the diameters of ball bearings produced by a suspected malfunctioning
In checking a random sample of 400 emergency room patients, a board member finds that 35% of those treated were not true emergency cases. Using an appropriate hypothesis test and the 0.05 level, evaluate the administrator's statement.
Suppose P(X = 1) = p and P(X = 0) = 1 - p = q. Find the mean, variance, and standard deviation of X in terms of p and q.- For what values of p (and q) is the variance of X greatest?
the average income tax refund for 2009 tax year was 3095. assumes the refund per person follows the normal probability
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