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Consider the following research: Eight hours of nightly sleep is not the health panacea you were brought up to believe, according to a study released suggesting a link between too much slumber and a shorter life span. Sleep experts immediately sought to discredit the conclusions and said they will only cause confusion. The study, published in the Archives of General Psychiatry, included 1.1 million men and women and found a longer life span among those who sleep six to seven hours a night. The lifespan declines progressively among those who sleep eight hours or longer. "Our study shows the average sleep for Americans of seven hours per night is safest," said Dr. Daniel Kripke, who led the study. Kripke is a professor of psychiatry who specializes in sleep research at the Univ. of California, San Diego. "You don't have to sleep eight hours per night; it's safe to sleep five, six or seven hours." The study showed people who slept 9 or 10 hours per night had a similar risk of dying to people with moderate obesity. Risk of death increased by 15 percent for those who slept 8 hours a night, 20 percent for those who get 9 hours of sleep and 35 to 40 percent for those who sleep 10 hours a night. "This is a happy message for five, six, seven hour sleepers and insomniacs that there's nothing to worry about. This is reassuring," said Kripke. The National Sleep Foundation, which recommends eight hours of sleep per night for optimal health, immediately attacked the study's findings and said they can do nothing but cause the public unnecessary confusion and concern. In your main post, use what you have learned in this course so far (observation/experiment, sampling, bias, descriptive statistics, etc.) to critique this study.
a. Do you agree or disagree with the study? Support your case using statistics. Present a summary of at least 4 sentences defending your position.
Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better?
Fast Service Truck Lines uses the Ford Super Duty F-750 exclusively. Management made a study of the maintenance costs and determined the number of miles traveled during the year followed the normal distribution. The mean of the distribution was 60..
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
AJ DAVIS is a department store chain, which has many credit customers and wants to find out more information about these customers. A sample of 50 credit customers is selected with data collected on the following five variables:
two points along a straight stick of length 39 cm are randomly selected. the stick is then broken at those two points.
a basketball coach wants to know how many free throws an nba playrs shoot during the course of an advantage pratice.
Based on the information, what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
suppose we have a set of 100 x y points. if we multiply all of the xs by 10 thena. the mean and standard deviation of
find the general solution for the ode yx2y20 and verify the answer by
Which of the following does not explain a possible relationship between variables when the null hypothesis is rejected
Assume that the data are normally distributed in the population. Now go back and examine the $1,250 figure published by Runzheimer International. Does it fall into the confidence interval computed from the sample data? What does it tell you?
question part points submissions used in a national survey of 2039 adults 1550 responded that lack of respect and
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