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Suppose that the average life of a refrigerator before replacement is m = 14 years with a (99.7% of data) range from 8 to 20 years. Let x = age at which a refrigerator is replaced. Assume that x has a distribution that is approximately normal. Find a good approximation for the standard deviation of x values
population 1 mean 36 and population 2 mean 45. both population standard deviations are 10. sample size per group 16.
a normally distributed random variable y has std dev. 800. a random sample of 100 observations was taken from y and
Assume that the histogram for Math SAT scores is symmetric and concentrated about 450. Estimate the percent of students who score higher than 650 of the Math SAT.
A person's body temperature is found to be 101.00 °F. Is the result unusual? Why or why not? What should you conclude? What body temperature is the 95th percentile?
Suppose U is a Unit (25, 50) random variable.Find the CDF of U and sketch a graph.
four possibly winning numbers for a lottery-ab-4536 nh-7812 sq-7855 and zy-3221- arrive in the mail. you will win a
A sample of 121 provided a sample mean of 77.3. The population standard deviation is known to be 16.5. Compute the value of the test statistic.
One of the points is suspected of being a bivariate outlier. When this point is removed, the new correlation is r = -.833. Is this point likely to be a bivariate outlier?
an iq test is designed so that the mean is 100 and the standard deviation is 22 for the population of normal adults.
please answer this question using r code. the answer for this quesiton can be easily be found with a google search
White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.
To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?
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