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Question: Plywood strength. How strong is a building material such as plywood? To be specific, support a 24-inch by 2-inch strip of plywood at both ends and apply force in the middle until the strip breaks. The modulus of rupture (MOR) is the force needed to break the strip. We would like to be able to predict MOR without actually breaking the wood. The modulus of elasticity (MOE) is found by bending the wood without breaking it. Both MOE and MOR are measured in pounds per square inch. Here are data for 32 specimens of the same type of plywood:
Can we use MOE to predict MOR accurately? Use the data to write a discussion of this question.
Washing machines leaving the factory that are defective. Obtain a sample size that will ensure a margin of error of at most 0.014 for a 97% confidence interval.
Assuming that the true proportion of all Pennsylvania households with annual incomes of at least $70,000 is 0.217, find the probability of not rejecting a false null hypothesis when the sample size is 200.
in a certain city 40 consider themselves conservatives c 35 liberals l and 25 independents i. during a particular
Possible Sample Proportions Favoring a Candidate Suppose that of all voters in the United States, 40% are in favor of Candidate C for president.
Consider these data as random samples from two independent normal populations; carry out an appropriate test to con?rm or refute the hypothesis that instrument 2 is less precise than instrument 1.
Describe a reasonable target population for the sample you used. Identify the sample - Do you feel that your sample is representative of this population?
write a problem which requries the reader to calculate standard scores also called a z-scores and use these to find
Mensa. People with z-scores greater than 2.5 on an IQ test are sometimes classified as geniuses. If IQ test scores have a mean of 100 and a standard deviation.
a team has won 17 championships over the past 68 years. thus it may seem reasonable to assume that in a given year the
assume that the heights of women are normally distributed with mean of 63.6 inches and a standard deviation of 2.5
STAT11048 (T1, 2016) - Assessment. In a mathematics test, a random sample of 2025 sixth graders had a mean score of 68.1 and a standard deviation of 9. Calculate the 95% confidence interval for the population mean
customers arrive at a checkout counter in a department store according to a poisson distribution at an average of
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