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The lifetime of a certain transistor in a certain application has mean 900 hours and standard deviation 30 hours. Find the mean and standard deviation of the length of time that four transistors will last.
Calculate 95% and 99% confidence intervals for m. Using the 95% confidence intervals, can we be 95% confident that m is a least 50 pounds? Explain.
the following data is the square footage in thousands of square feet and annual sales in millions of dollars for a
Lipitor is a drug used to control cholesterol. In clinical trials of Lipitor, 94 subjects were treated with Lipitor and 270 subjects were given a placebo.
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
suppose a simple random sample of size 50 is selected from a population with ? 10. find the value of the standard
the reading speed of second grade students in large city is approximately normal with a mean on 90 words per minute and
Suppose we select a sample of 40 tires and use a simulator to determine the tread life. What is the likelihood of finding that the sample mean is between 59,050 and 60,950?
a weight lifter puts an x-pound weight on each side of a bar. a weight 5 pounds heavier than the first is then added to
1. a study of machiavellian traits in consultants was performed. the consultants were then classified as having
In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a sample of 49 customers. At 95% confidence, what is the margin of error (to 1 decimal)?
What terms describe the fit of a regression equation to the data? What is the practical use of the regression equation in the real world? Explain with some examples.
a deck of cards is shuffled and you choose one at random observe its colour and replace it in the set. the cars are
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