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In an effort to improve the vocabulary of 10 students, a teacher provides a weekly 1-hour tutoring session for them. A pre-test is given before the sessions and a post-test is given afterwards. The results are show in the table. at alpha .01, can the teacher conclude that the tutoring sessions helped improve the students' vocabularies?
Student 1 2 3 4 5 6 7 8 9 10
Before X1 83 76 92 64 82 68 70 71 72 63
Before X2 88 82 100 72 81 75 79 68 81 70
Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent and that they have been randomly selected.
experiments have shown that when a clean tungsten surface is heated by laser irradiation using a focused ruby laser the
College students are a major target for advertisements for credit cards. At a university, 65% of students surveyed said they had opened a new credit card account within the past year.
Given the following data on Asian and European Share of U.S. Light Truck Sales(1990-2003): Which trend model is best, and why? If none is satisfactory, explain.
1. the company believes that it averages about the same weight per bag in each of two production lines. to test this
For a population with a mean of 60 and a standard deviation of 24, find the z-score corresponding to each of the following samples. What is Om for each equation?
two points are selected randomly on a line of length 40 so as to be on opposite sides of the midpoint of the line. in
The data in below represent the closing value of the Dow Jones Industrial Average (DJIA) over the 29 year period from 1979 through 2007.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
provide a different example for each of the following types of variables from your work or home lifea a nominal level
according to the sleep foundation the average nights sleep is 6.8 hours fortune march 20 2006. assume the standard
chi-square test for goodness of fit.there are four entrances to the government center building in downtown
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