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In this problem, we explore the effect on the standard deviation of adding the same constant to each data value in a data set. Consider the following data set.
4, 13, 5, 14, 10
(a) Use the defining formula, the computation formula, or a calculator to compute s. (Enter your answer to one decimal place.)
(b) Add 3 to each data value to get the new data set 7, 16, 8, 17, 13. Compute s. (Enter your answer to one decimal place.)
Two impendent samples of signs 9 and 8 gave the sum of squares of deviation from their respective means as 160 and 91 can the samples be regarded as drawn from the normal population with equal variance
The mean is 75 and the standard deviation is 6. If 1200 students took the test, approx how many students would be expected to score between 69 and 81?
Estimate a regression model with trend & season dummies to forecast the next year sales:
Frequencies of Responses in the Five Categories of the Self-Reported Bullying and Victimization Variables at Wave 3
Thirty-five fourth-grade students were asked the traditional question "what do you want to be when you grow up? The responses are summarized in the following table:
A multiple choice test consists of 25 questions with possible answers of a, b, c, d, and e. Estimate the probability that with random guessing, the number of correct answers is between 3 and 10 inclusive.
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
Determine the mean number of times the machine was used per day.
assume that the mean sat score in mathematics for 11th graders across the nation is 500 and that the standard deviation
oil field pipes are internally coated in order to prevent corrosion. researchers investigated the influence that
What is the actual formula for finding the exact probability from the z-score without having to use the table?
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