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Marathons 2006. Shown are the winning times (in minutes) for men and women in the New York City Marathon between 1978 and 2006. Assuming that performances in the Big Apple resemble performances elsewhere, we can think of these data as a sample of performance in marathon competitions. Create a 90% confidence interval for the mean difference in winning times for male and female marathon competitors.
Assume that company A makes 80% of all electrocardiograph machines, company B make 15% of them, and the company C makes the other 5%.
What is the probability that more than one unit has failed, given that the first defective unit is the nth?
a lot collection consisting of 200 fuses is inspected by taking 10 fuses at random and without replacement. if all 10
consider an x-bar chart where the x-bar statistic is normally distributed and an associated x-bar control chart exists.
A product sold by Home Depot, Inc., with an annual demand of 1000 units has Co = $25.50 and Ch = $8. The demand exhibits some variability such that the lead-time demand follows a normal probability distribution
in a normal distribution find the probability expressed as a percentage that is greater than a z score of
Determine the autocorrelation function of the output.- Make a reasonable approximation to obtain a simplified form.
Over a 20 year period, the average grade point average of applicants to our graduate program has been found to be 3.27. This year the mean grade point average of the 57 students applying to our graduate program is 3.53
The median income for a random sample of households in a school district was found to be $56,300.- Describe the difference between descriptive statistics and inferential statistics in the context of this example.
For which of the variables depicted in the histograms would you most strenuously insist on using an IQR rather than a standard deviation to summarize spread?
Is a sample of 25 papers large enough to provide a good estimate of the mean score of all 42,000 students on this exam problem? Justify your answer.
determine the present worth of a series of annual deposit of 1200 during years 5 through 14 and a series of withdrawals
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