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You are interested in whether the data you have collected provide sufficient evidence to indicate a difference in mean serum uric acid levels between individuals without Down's syndrome and individuals with Down's syndrome. The data consist of serum uric acid readings on 12 individuals with Down's syndrome and 15 individuals without Down's syndrome. The means are 4.5 mg/100 ml for the Down's sample and 3.4 mg/100 ml for the sample of individuals without Down's syndrome. Assume that the two independent samples are drawn from normally distributed populations with variances equal to 1 and 1.5 for the Down's and non-Down's samples, respectively. Do you have sufficient evidence to indicate a difference in uric acid levels? Assume α = 0.05, state the hypothesis that you are testing, show all calculations, provide the p value for the test statistic, and provide the 95% confidence interval for the difference between the two means.
let x and y be independent exponential random variables with means 2 and 3 respectively. let zxy. determine
Suppose that we generate a random sample from a given dis- tribution. If it is desired that the probability that the sample mean will be within 2 standard deviations of the mean of the distribution is at least .99, how large should the sample size..
Can you generalize this to each possible random digit/outcome in the sample space?
A study was done to see whether participants would ignore a sign that read, "Elevator may stick between floors. Use the stairs."
the life expectancy of point-of-sale pos terminals is normally distributed with a mean of 4 years and a standard
Violence and lack of discipline have become major problems in schools in the US.
(1) Make the entry to record the partial refunding. Assume Jenks Co. makes reversing entries when appropriate. (2) Prepare the adjusting entry at December 31, assuming straight-line amortization of the discount
The mean per capita consumption of milk per year is 126 liters with a standard deviation of 24 liters.
the australian bureau of statistics recently released figures on petrol usage. following are the 15 leading cities in
Calculate the horizontal component of the initial velocity of the shell.
a residential heat pump with a coefficient of performance of 2.2 delivers energy to the dwelling at a rate of 23 kw.
Notice that a higher proportion of placebo takers than Seldane-D takers reported headaches. Use that information to explain why it is important.
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