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The survival times (in months) for two treatments for patients with severe chronic leftventricular heart failure are given in the following tables.
a. Construct separate relative frequency histograms for the survival times of both thetherapies.
b. Compare the two histograms. Does the new therapy appear to generate a longer survival time? Explain your answer.
Consider the following hypothesis test What is the value of the test statistic? What is the p-value? With a=.05, what is your conclusion, reject or accept?
Given the standardized normal distribution (with a mean of 0 and a standard deviation of 1, as in Table E.2), what is the probability that:
The mean weight of 500 students is 151 lbs and the standard deviation is 15 lbs. Assuming the weights are normally distributed, find out how many students weigh between 120 and 155 lbs.
binomial distribution. the centers for disease control say that 30 of high school students smoke cigarettes. suppose
the distribution of heights of adult males is normally distributed with mean 68 inches and standard deviation 2.9
Assuming that there is no exchange of information, or influence, across universities as to their hiring decisions, and that the chancellor is as likely to be chosen as any other applicant, what is the chancellor's probability of getting at least o..
in a recent nyc marathon 25221 men finished and 253 dropped out. 12 883 women finished and 163 dropped out use a 0.01
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Find the 90% confidence interval for the standard deviaiton of the ages of seniors at Oak Park College if a sample of 24 students has a standard deviation of 2.3 years. Assume the variable is normally distributed.
Draw ogives from the following data and measure the median value and compute the value of arithmetic mean
Indicate with Yes or No whether the given statement could apply to a data set consisting of 1,000 values that are all different. a. The 29th percentile is greater than the 30th percentile.
Find the probability of an untrained dog performing as well as Maggie. Is it unusual for an untrained dog to do as well as Maggie?
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