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In a study of women and heart disease, the following sample results were obtained: Among 10,239 women with low level of physical activity (less than 200 kcal/wk), there were 101 cases of heart disease. Among 9,877 women with physical activity measured between 200 and 600 kcal/wk, there were 56 cases of heart disease.
A. Construct a 90% confidence interval for the difference between the two proportions.
B. At α = 0.10, is there enough evidence to conclude that physical activity reduces the risk of heart disease?
find the following percentiles for the standard normal distribution. interpolate where appropriate. round your answers
Write Lex regular expressions (using character classes if you wish) that match the following sets of strings:(a) The set of all unprintable ASCII characters (those before the blank and the very last character)
A personnel manager has a computer-generated list of all employees that indicates that 70 percent are full-time employees, 20 percent are part-time employees, and 10 percent are furloughed or laid-off employees.
Peter and Paul agree to meet at a restaurant at noon. Peter arrives at a time normally distributed with mean 12:00 noon, and standard deviations 5 minutes.
a jobs are sent to a printer at an average of 4 jobs per hour.i what is the expected time between jobs?ii what is the
A statistics profressor plans classes so carefully that the lengths of her classes are uniformly distributed between 50.0 and 60.0 minutes. Find the probability that a given class period runs great than 50.5 minutes.
Normally distributed with a mean of 52 and a standard deviation of 3. What is the probability that the MPG for a selected mid-size car would be greater than or equal to 50.
it has been stated that 75 of the population have a smart phone. if you randomly choose 10 people what is the
What is the difference between a null hypothesis and an alternative hypothesis? Is the null hypothesis always the same as the verbal claim or assertion that led to the test? Why or why not?
Refer to the simple linear regression relating games won by a major league baseball team y to team batting average x, Exercise 9.15 (p. 485). The SPSS printout is reproduced below.
Construct a 99% confidence interval for the mean d of the population paired differences, where a paired difference is equal to the time taken before.
Suppose that a car rental agency offers insurance for a week that will cost $10 per day. A minor fender bender will cost $1,200 while a major accident might cost 10,000.
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