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Two high schools are completing in a track meet. The net event is the one hundred meter dash. The coach of the Cheetahs has asked you to construct an interval estimate of how much faster the opposing team's sprint unit is than the Cheetah's sprinters. The Cheetah's coach tells you that five of his sprinters average 11.5 seconds in the 100 meter dash and that their times have a standard deviation of seconds. He says that his runners' times are normally distributed. The Cheetah's coach also scouted the other team the Rockets. He was able to observe six of their runners. The rockets sprinters had an average time of 11.35 seconds with a standard deviation of 0.2 seconds . The cheetahs' coach believes that the Rockets' times are normally distributed as well. Construct a 95% confidence interval the Coach to compare the two teams' sprint units.
Determine the mean and the standard deviation of the sample.
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
When we carry out a chi-square test of independence, the expected frequencies are based upon the Null hypothesis - true or false.
The average number of typos on one page of a manuscript is 8. What is the probability that 4 to 6 type appear on 2 pages of the manuscript? Imagine Poisson distribution.
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
Consider the continuous random variable X, which has a uniform distribution over the interval from 20 to 28. The probability that X will take on a value between 21 and 25 is.
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
Ms. Tina Stevens just purchased a new dress that cost $120. What is the probability she paid cash or check? (Round your answer to 3 decimal places.)
Recent actual and forecasted data for product XYZ is given in the following table.
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