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Suppose we take a random sample of size n from a normal population with variance, σ2 . It can be shown that (n−1)s2/σ2 has a chisquare distribution with n−1 degrees of freedom, where s is the sample variance. Below is a
asked by sandy on March 18, 2013 
Statistics and Probability
Suppose you took 1000 random samples of size 200 from the Poisson distribution with u = 5 and computed a 90% confidence interval for each sample. Approximate the probability that at least 920 of these intervals would contain the
asked by Adam on March 27, 2011 
Statistics and Probability
Suppose you took 1000 random samples of size 200 from the Poisson distribution with u = 5 and computed a 90% confidence interval for each sample. Approximate the probability that at least 920 of these intervals would contain the
asked by Adam HELP PLEASEEE on March 26, 2011 
statistics
450 people are randomly selected at grocery stores across the state and surveyed on the amount of money they are spending at the store that day. How does finding the sample variance compare to investigating the sampling
asked by maczindahouse on February 20, 2019 
Statistics
You are interested in estimating the mean of a population. you plan to take a random sample from the population and use the samples mean as an estimate of population mean. Assuming that the population from which you select your
asked by Winston on October 25, 2016 
Statistics and Probability
A computer supply house receives a large shipment of blank CDs each week. Past experience has shown that the number of flaws per CD can be described by the following probability distribution, where the random variable X represents
asked by Adam on March 9, 2011 
Bcc
suppose x has a moundshaped distribution. A random sample size 16 has a sample mean of 10 and a sample standard deviation of 2. Find 99% cinfidence interval for mue (mean) using a student's t distribution.
asked by Yira f on December 4, 2014 
math
Conditioned on the result of an unbiased coin flip, the random variables T1,T2,…,Tn are independent and identically distributed, each drawn from a common normal distribution with mean zero. If the result of the coin flip is
asked by Adam on July 13, 2019 
statistics
Suppose X has a moundshaped distribution with sigma=9. A random sample of size 36 has a sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean u?
asked by Tracey on June 5, 2012 
Math Statistics
3. Suppose 20% of all heart transplant patients do not survive the operation. a. Think about taking repeated random samples of 371 patients from this population. Describe how the sample proportion who die would vary from sample to
asked by TCaesar on July 22, 2013