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The probability that a randomly selected pregnancy lasts less than 149 days is approximately .3821.
The probability that the mean of a random sample of 21 pregnancies is less than 149 days is approximately .0846.
The probability that the mean of a random sample of 55 pregnancies is less than 149 days is appox ??? (round to 4 decimal places as needed)
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
A study concluded that waist to hip ratios are a better predictor of 5-year survival than more traditional height-to-weight ratios.
Will an SRS of size 1785 usually give a result p-hat within plus or minus 3 percentage points of the true population proportion? Explain.
a random variable x has a probability density function fx 2x for 0 lt x lt 1.find the difference between 10th
According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy and electronically file a 1040 tax form. This distribution of times follows the normal distribution and the standard deviation is 80 minutes.
question in a discrete mathematics class every student is a major in computer science or mathematics or both. the
testing for population mean.a quality control expert is called in to determine whether a newly installed machine is
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.
I want to establish if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.
Quality control studies for Leaky Jet Computer Printers show the lifetime of the printer follows a normal distribution with a mean of 4.5 years and a standard deviation of 0.85 years.
Citrus Rental is a popular car rental agency that has a history of having too few cars available, so that its available cars are overdriven. The mean monthly mileage over the years for Citrus cars has been about 1550 miles per month.
Nine percent of undergraduate students carry credit card balances greater than $7000. Presume 10 undergraduate students are selected randomly to be interviewed about credit card usage.
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