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Exercise and healthy bones. Many studies have suggested that there is a link between exercise and healthy bones. Exercise stresses the bones and this causes them to get stronger. One study examined the effect of jumping on the bone density of growing rats.16 There were three treatments: a control with no jumping, a low-jump condition (the jump height was 30 centimeters), and a high-jump condition (60 centimeters). After 8 weeks of 10 jumps per day, 5 days per week, the bone density of the rats (expressed in milligrams per cubic centimeter) was measured. Here are the data:
(a) Make a table giving the sample size, mean, and standard deviation for each group of rats. Is it reasonable to pool the variances?
(b) Run the analysis of variance. Report the F statistic with its degrees of freedom and P-value. What do you conclude?
Suppose that we wish to estimate the average daily pollution in Lake Erie. The daily yield, recorded for n = 50 days, produced a mean and standard deviation equal to y = 871 tons and s = 21 tons, respectively.
the average length of stay at a local hospital is 4.9 days. assuming a population standard deviation of 3.5 days what
Write a program to calculate students average test scores and their grades - a method to read and store data into two arrays, a method to calculate the average test score and grade and a method to output the results.
List the five-number summaries of the number of days between the receipt of a complaint and the resolution of the complaint and construct boxplot and describe the shape of the distribution of the data.
Distinguish and evaluate the three Marxist critiques of capitalism
at a certain university the average attendance at basketball games has been 2825. this year the attendance for the
According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of major surgery patients are dissatisfied with after-surgery care in the hospital. A scientific poll based on 400 hospital patients has ju..
Assuming no discrimination based on gender, what is the probability of getting 41 or fewer women when 100 new employees are hired?
on completing this chapter you should be able to correctly answer the following questions.a. true or false it is
What is the mean number among 12 truthful persons who will be classied as deceptive? What is the standard deviation of this number?
Firms planning to build new plants or make additions to existing facilities have become very conscious of the energy efficiency of proposed new structures and are interested in the relation between yearly energy consumption and the number of squar..
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
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