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Question: A big-toe problem A bunion on the big toe is fairly uncommon in youth and often requires surgery. Doctors used X-rays to measure the angle (in degrees) of deformity on the big toe in a random sample of 37 patients under the age of 21 who came to a medical center for surgery to correct a bunion. The angle is a measure of the seriousness of the deformity. For these 37 patients, the mean angle of deformity was 24.76 degrees and the standard deviation was 6.34 degrees. A dotplot of the data revealed no outliers or strong skewness.
(a) Construct and interpret a 90% confidence interval for the mean angle of deformity in the population of all such patients.
(b) Researchers omitted one patient with a deformity angle of 50 degrees from the analysis due to a measurement issue. What effect would including this outlier have on the confidence interval in part (a)? Justify your answer without doing any calculations.
According to BusinessWeek, 50% of top managers leave their jobs within 5 years. If 25 top managers are followed over 5 years after they assume their positions.
A mean of 25 inches and a standard deviation of 5 inches. What is the probability that the area receives at least 30 inches of rain in a year?
a researcher collects data to see if medical insurance type and doctors visits per year are related. he obtains the
NCAA Basketball Tournament. Each year, 64 college basketball teams compete in the NCAA tournament. Sandbox.com recently offered a prize of $10 million to anyone who could correctly pick the winner in each of the tournament games.
Marketing and Consumer Behavior According to a recent survey, Americans are keeping their cars longer. Some of the reasons may include the poor economy.
a large chain retailer purchases a certain kind of electronic device from a manufacturer. the manufacturer indicates
Home prices in a city have mean µ = $200,000 and standard deviation s = $25,000. For n = 25 randomly selected homes, the mean price is = $208,000.
1. Using both Hofstede's list of value dimensions and Hall's categories of cultural differences, list 3 or 4 of these that would be barriers for you to personally overcome if you had to work or live in a different culture.
In your capacity as assistant sales manager for a large office products retailer, you have been assigned the task of interviewing purchasing managers for medium and large companies in the San Francisco Bay area.
How Large a sample is needed to estimate the true proportion of homeowners who have vegetable gardens to within 3 percentage point 92% confidence.
Assuming normal populations with equal standard deviations, does it appear that the average number of television hours per week could be equal for these two populations? What is the most accurate statement that could be made about the p-value for ..
Heart rate and exercise. A student project asked subjects to step up and down for three minutes and measured their heart rates before and after the exercise.
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