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People gain weight when they take in more energy from food than they expend. A Mayo Clinic study investigated the link between obesity and energy spent on daily activities. They chose healthy volunteers, none of whom exercised on a regular basis. Ten of the subjects were lean, and ten were mildly obese (heavy). They attached sensors to monitor the subjects' movements for ten days. The time (in minutes per day) spent standing or walking for each subject is provided in the Excel spreadsheet. (10 points)
a) State your null and alternative hypotheses.
b) Calculate the mean and standard deviation for each group.
c) Compare the two group means and test your hypothesis. State your conclusion in terms of the hypothesis and report the associated probability.
d) Compute the confidence interval for the difference between the two sample means.
The mean time for these workers is = 39.8 seconds and the -value less than 0.0001. It is appropriate to conclude which of the following?
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
What is the mean and standard deviation of the sampling distribution of x-bar assuming that mean =20 and standard deviation equals the square root of 20?
You are told that twenty-five percent of the player names in the hat are quarterbacks and that forty percent of the players in the hat have Porsches in their garage at home. What is the likelihood that you will get to go to lunch with a quarterbac..
there are 10 employees in a particular division of a company. their salaries have a mean of 80000 a median of 60000 and
You receive another question asking how the overall probability of winning a prize in the Powerball lottery is determined. The overall probability of winning a prize in the Powerball lottery is 1 /35. Write an explanation that answers the question an..
if a study had a result of f 2 147 4.56 p 0.003 how many groups were in the study and what was the sample
The American Bankers Association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases (The Wall Street Journal, December 16, 2003). In 1999, the following usages were reported.
The next 6 are assigned to treatment B. The last 6 are assigned to treatment C. Do you see any problem with this strategy of assigning treatments to experimental units?
The mean life time of the sample of 160 tires will be less than 39,000 miles? Interpret the probability in terms of the truth of the manufacturer's claim.
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 16. At alpha = 0.05 is there enough evidence to reject the researche..
Use rejection points and previously given sample information to test the hypothesis you set up in part a by setting alpha equal to 010, .05, .01, and .001.
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