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Question: The variance of the SAT scores for all students who took that test this year is 5000. The variance of the SAT scores for a random sample of 20 students from one school is equal to 3175.
a. Test at the 2.5% significance level whether the variance of the SAT scores for students from this school is lower than 5000. Assume that the SAT scores for all students at this school are (approximately) normally distributed.
b. Construct the 98% confidence intervals for the variance and the standard deviation of SAT scores for all students at this school.
The dataset Length.jmp contains a simple random sample of 50 stainless steel sheet metal screw from Crown Bolt
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A standard deviation of 20. If the seller wishes to have adequate stock 95% of the time, how many of the games must she keep on hand.
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In many ways, comparing multiple sample means is simply an extension of what we covered last week. Just as we had 3 versions of the t-test (1 sample, 2 sample (with and without equal variance), and paired;
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List the steps involved in hypothesis testing using: a) the traditional/classical method; b) the probability-value method. Provide an example of each.
The probability that Alice will fail her probability exam is .15. The probability that Box will fail his exam is.09. The probability that both fail is .05. What is the probability that both will pass?
a researcher estimates the 95 ci for a sample with a mean of m 3.26 and a standard error ?m of 0.91. what is the upper
Through the Feasted Landscapes Sustainability in American Topics, Chapter "The Work of the U.S. Sanitary Commission (1864)":
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