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A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 12 subjects had a mean wake time of 97.6 min and a standard deviation of 43.8 min. Assume that the 12 sample values appear to be from a normally distributed population and construct a 90% con?dence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective? Find the con?dence interval estimate.
What is the present value of the cash flows from your lottery winnings?
Minorities the NAACP claimed that in Volusia County, Florida, police stopped dark-skinned drivers on I-95 who were not violating the law much more frequently.
For each correlation coefficient below, calculate what proportion of variance is shared by the two correlated variables:
Give examples of open and closed questions for a job interview. What are the advantages and disadvantages of each type of questions?
in the biathlon event of the olympic games a participant skis cross-country and on four intermittent occasions stops
Investigate the "randomness" of the table of random digits given at the end of this book by regarding the 200 digits in the first five rows of the table
Explain in your own words why the test statistic for Goodness-of-Fit is similar to the calculation for Population Standard Deviation.
What is the probability of getting Full-House, which is two of a kind and three of kind, in the first hand (Example 2 Aces and Three Queens)?
Assume that the number of shares traded on the ASX is a normal random variable with a mean of 992 million and a standard deviation of 252 million
find the indicated probabilities using the geometric distribution or poisson distribution. then determine if the
At the 0.05 level of significance, test H0: μ ≤ 220 versus H1: μ > 220. Determine and interpret the p-value for the test.
Test the claim at a = 0.05 that µ >15. A sample size of 30 yields a sample mean of 17.5 and a sample standard deviation of 5.
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