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1. It is believed that the range of hourly wages paid to auto mechanics in a large city is $9 (range approx. = 4sigma-squared). If we assume that hourly wages are approximately normally distributed, how large a sample is necessary so that with probability 0.99 the sample mean will be within one dollar of the true average hourly wages?
Automobile manufacturers are interested in the difference in reaction times for drivers reacting to traditional incadescent lights and to LED lights.
Assuming an exponential service rate μ, set this up as a birth and death process and determine the birth and death rates.
Find the critical F value for the Following,
Shopper Trak is a hidden electric eye designed to count the number of shoppers entering a store. When two shoppers enter the store together one walking in front of the other, the following possibilities apply.
A group of teenagers were monitored closely over the period of several weeks to measure how frequently they watched violent television programs.
Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.
Complete the test at the 5% level of significance.
At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule.
A population of scores has p = 44. In this population, an X value of 40 corresponds to z = - 0.50. What is the population standard deviation.
A box contains 9 tickets numbered 1 to 9 inclusive. If 3 tickets are drawn from a box one at a time, find the probability that they are alternative after (1) odd, even, odd or (2) even, odd, even.
the maximum point total for the quarter was 200. The point totals for the 10 students are given in the stemplot below. For the density curve displayed below, which of the following is true?
What is the probability that: The amount requested is $80,000 or more?
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