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1. Prestressed wire wrapping concrete pipe is manufactured in large rolls. A quality-control inspection requires 5 specimens from a roll to be tested for ultimate tensile strength (UTS). The UTS measurements (in 1000 psi) turned out to be 253, 261, 258, 255, 256.
2. Use these data to construct a 95% confidence interval estimate of the true mean UTS for the sampled roll. What assumption you have assumed?
3. Calculate and interpret a 95% prediction interval for a new specimen selected at random from the roll.
in 2011 the price of a business math text rose to 98. this is 11 more than the 2010 price. what was the old selling
A manufacturer claims that the mean lifetime of its light bulbs is 55 months. The standard deviation of these lifetimes is 6 months. Twenty-two bulbs are selected at random, and their mean lifetime is found to be 56 months.
the results of a newsweek poll concerning views on abortion showed that of n 1002 adults 39 favored the right-to-life
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
What is the formula used to get percentile from z-score? I have z-scores but am using excel and want to be able to type in a formula to figure percent instead of coming here and continuing to figure it out.
part aanswer all of these questions using r commander. include all graphs outputs from r commander .this assignment
Based on a sample of 49 students, Healthy Lifestyles Incorporated (HLI) would like to apply the central limit theorem to ma ke various estimates. a) Compute the standard error of the sample mean. (Round your answer to 2 decimal places.)
A quadratic revenue function often occurs in practice. The reason is that as more units are produced, the price must be lowered in order to sell them all.
A marketing analyst was studying the readability of two advertisements, each produced by a major company, and printed in the newspaper.
The probability that a patient recovers from a disease is 63%. What is the probability that:
Imagine that these results are disseminated to the general public through publication and media coverage. Write about one possible harmful consequence that these conclusions could have in the "everyday" world.
the state test scores for 12 randomly selected high school seniors are shown on the right. assume the population is
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