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The mean lifespan is 71.45 years, and the standard deviation is 12.35 years. Mrs Wenger would like to know how many days, on average, presidents tend to live beyond their 70th birthday. Find the mean and standard deviation of the transformed data. Note: There are 365 days in a year.
Sound City sells the ClearTone-400 satellite car radio. For this radio, historical sales records over the last 100 weeks show 4 weeks with no radios sold
The human resources department at a large multina- tional corporation wants to be able to predict average salary for a given number of years experience. Data on salary (in $1000's) and years of experience were collected for a sample of employees.
(a) lie below -1.96Z if 1000 scores are plotted in the distribution? (b) are plotted between -1.96Z and +1.96Z ?
On the basis of the values of z* found in parts (a) through (c), explain what happens to the width of the confidence interval when the confidence level is increased.
What is the right tail percentile required to reject the null hypothesis?
Estimate the probability that if someone tests negative, they do not have the disease.
iq test scores are normally distributed with a mean of 100 and a standard deviation of 15. an individual?s iq score is
a camera manufacturer just shipped a batch of 36 digital cameras to local retailers and seven of the cameras have a
A dishwasher has a mean life of 10 years with an estimated standard deviation of 1.05 years ("Appliance life expectancy," 2013).
You attempt a 50 item (n = 50) true-and-false exam. You did not study for the material and your attempt to answer any item is a guess, with a 50% chance that you will get any item correct. You need a score of 30 or better to pass the exam.
Pat wants to compare the cost of one- and twobedroom apartments in the area of her college campus. She collects data for a random sample of 10 advertisements.
suppose that the mean value of interpupillary distance the distance between the pupils of the left and right eyes for
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