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Jumping and strong bones. Many studies suggest that exercise causes bones to get stronger. One study examined the effect of jumping on the bone density of growing rats. Ten rats were assigned to each of three treatments: a 60-centimeter "high jump," a 30-centimeter "low jump," and a control group with no jumping. Here are the bone densities (in milligrams per cubic centimeter) after eight weeks of 10 jumps per day:
(a) The study was a randomized comparative experiment. Outline the design of this experiment.
(b) Make side-by-side stemplots for the three groups, with the stems lined up for easy comparison. The distributions are a bit irregular but not strongly non-Normal. We would usually use analysis of variance to assess the significance of the difference in group means.
(c) Do the Kruskal-Wallis test. Explain the distinction between the hypotheses tested by Kruskal-Wallis and ANOVA.
(d) Write a brief statement of your findings. Include a numerical comparison of the groups as well as your test result.
Find the probability that the 3rd club is drawn on the 8th selection. - Find the probability that at least 8 cards are drawn before the 3rd club appears.
Percentage grades in a large chemistry class follow a normal distribution with mean 67 and standard deviation 8. (a) What proportion of students in the class receive a grade lower than 56.5?
1. Provide a description of one method for estimating the reliability and one method for substantiating the validity of a test. 2. Discuss the conditions under which each method is appropriate and/or inappropriate.
A production process that is in control has a mean (m) of 80 and a standard deviation (s) of 10. Determine the upper and the lower control limits for sample sizes of 25
question in a study investigating freshman weight gain the researchers also looked at gender differences in weight
Consider a binary hypothesis in which there is a cost associated with each type of decision. In addition to the cost C'10 for a false alarm and C'01 for a miss, we also have the costs C'00 for correctly guessing hypothesis H0 and the C'11 for correct..
research has shown that 80 of patinets with a particular chronic condition improve as a result of surgery. assuming
Unless indicated otherwise, round your answer to one more decimal place than is present in the original data values.The students in Hugh Logan's math class took the Scholastic Aptitude Test. Their math scores are shown below. Find the mean score.
The mean amount of life insurance per household in the United States is $110,000. What is the likelihood of selecting a sample with a mean of at least $112,000?
(a) State H0 and Ha. (b) Find the criticalvalue(s). (c) Find the standardized test statistic z. (d) Decide whether to reject or fail to reject the null hypothesis and interpret the decision.
do one of the following as appropriate a find critical value za2 b find critical value ta2 c state that neither
On average, how much difference should exist between the population mean and the sample mean for n= scores randomly selected from the population?
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