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Question: Exercise Yourself to Sleep According to the UC Davis Health Journal (November-December 1997, p. 8), older adults constitute only 12% of the population but receive almost 40% of the sedatives prescribed. The purpose of this randomized experiment was to see if regular exercise could help reduce sleep difficulties in older adults. The 43 participants were sedentary volunteers between the ages of 50 and 76 with moderate sleep problems but no heart disease. They were randomly assigned either to participate in a moderate community-based exercise program four times a week for 16 weeks or continue to be sedentary. For ethical reasons, the control group was admitted to the program when the experiment was complete. The results were striking.
The exercise group fell asleep an average of 11 minutes faster and slept an average of 42 minutes longer than the control group. Note that this could not be a double-blind experiment because participants obviously knew whether they were exercising. Because sleep patterns were selfreported, there could have been a tendency to err in reporting, in the direction desired by the experimenters. However, this is an example of a well-designed experiment, given the practical constraints, and, as the authors conclude, it does allow the finding that "older adults with moderate sleep complaints can improve self-rated sleep quality by initiating a regular, moderate-intensity exercise program" (p. 32).
We use 2,750 per year of a certain subassembly that has a purchase cost of $450, and an annual holding cost of $400 per unit. Each order placed costs
a firm wanted to see if there was a significant difference between two neighboring communities in terms of the mean
please answer this question using r code. the answer for this quesiton can be easily be found with a google search
long-time friends pat and tom agree on many things but not the outcome of the american league pennant race and the
Assuming the population of Math SAT scores for seniors in the district is approximately normally distributed, a 90% confidence interval for the mean Math SAT score μ for the population of seniors computed from these data is?
A sample of size n = 14 is selected from a normal population to construct a 95% confidence interval estimate for a population mean. The interval was computed to be (7.82 to 9.64). Determine the sample standard deviation.
If you look at the power curve or the OC curve of a two-tailed test, you see that there is no region that represents instances of type I error.
For the following simple random sample of house- hold incomes (thousands of dollars) from a large county, construct and interpret the 90% and 95% confidence intervals for the population mean. The data are also in file XR09087.
However, with a large enough sample, this change can be significant. To see this, calculate the P-value for the test of Ho: µ = 2403.7
Find the sample space S for this experiment.- List the outcomes in each of the events A, B, C, and D.- List the outcomes in the events A ∪ B and A ∩ B.
Several factors are involved in the creation of a confidence interval. Among them are the sample size, the level of confidence, and the margin of error. Which statements are true?
Congratulations! To get to this point you have your project set up properly and you have all the summary statistics in the table below. Here is a summary of where you are in your attempt to determine if the average body temperature of healthy a..
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