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Concepts and applications
Find the Range and Standard Deviation
Old Faithful Geyser; Time intervals (in minutes) between eruptions of Old Faithful geyser in Yellowstone National Park:
98 92 95 87 96 90
65 92 95 93 98 94
Based on the information in part (a), what decision should the director make about the books used for the courses if the goal is to keep the cost below $300.00?
Assume that a simple random sample of a population has been selected from a population that has a normal distribution, Use the formula for X2( chi square distribution) and the chi-square distribution table
The useful life of an electrical component is exponentially distributed with a mean of 2500 hours. a. What is the probability the circuit will last more than 3,000 hours.
the professor plots a histogram of these several proportions. Should a Normal model be used to represent the sampling distribution of the proportion of tails?
An accounting firm has recently recruited six graduates: three men and three women. Three of the graduates are to be selected at random to work in the firms suburban office. Construct a probability tree.
A general contractor is considering purchasing lumber from one of two different suppliers. A random sample of 12 "2x4's" of a certain length of each board is measured.
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
If he were to randomly select 120 corks from the next box, then how many of these corks would John expect to be undersized?
Construct a 90% confidence interval to estimate the difference of (average number of gallons sold on weekdays - average number of gallons sold on weekends). Assume the population standard deviations are the same for both weekdays and weekends.
A manufacturer of printed circuit boards uses exponential smoothing with trend to forecast monthly demand of its product. At the end of December, the company wishes to forecast sales for January.
Complete hypothesis test using a 5% level for risk with directional research hypothesis.
Mean of 950 and a standard deviation of 200. nancy bright's sat score was 1390. what percentage of students have scores more than nancy bright?
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