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The administrator of a physical therapy facility has found that postoperative performance scores on a knee flexibility test have tended to follow a normal distribution with a standard deviation of 4.
For a simple random sample of ten patients who have recently had knee surgery, the scores are as follows: 101, 92, 94, 88, 52, 93, 76, 84, 72, and 98. Construct and interpret the 90% and 95% confidence intervals for the population mean.
A standard deviation of 10 grams. If we select one box of cereal at random from this population, what is the probability that it will weigh less than 895 grams?
Develop a scatter diagram for the data and write a brief summary.
You are comparing two cars, the first one is US-made with a 150 hp engine, which has been repaired once, and the second one is a Japanese car with a 200 hp engine, which has not been repaired. Which car do you expect to have higher MPG, and by how..
question consider the following record of sales for a product for the last 100 days. sales unitsnumber of days
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
Exercise and heart rate. A student project measured the increase in the heart rates of fellow students when they stepped up and down for three minutes to the beat of a metronome.
Mean and standard deviation for new sample were then computed to be M _ 6 and s _ 3. Write down the values of mean and standard deviation for original sample?
how would i set up the following stats questions of the households in the u.s 18 million or 17 have 3 or more
on a particular test iq scores for adults follow a bell-shaped symmetric distribution with mean100 and a variance of
A shopping mall has set up a promotion as follows. With any mall purchase, the customer gets to spin the wheel shown here. If the number I comes up, the customer wins $10.
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in..
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