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Question: According to the Sacramento Bee (2 April 1998, p. F5), Americans get an average of 6 hours and 57 minutes of sleep per night. A survey of a class of 190 statistics students at a large university found that they averaged 7.1 hours of sleep the previous night, with a standard deviation of 1.95 hours.
a. Assume that the population average for adults is 6 hours and 57 minutes, or 6.95 hours of sleep per night, with a standard deviation of 2 hours. Draw a picture similar, illustrating how the Rule for Sample Means would apply to sample means for random samples of 190 adults.
b. Would the mean of 7.1 hours of sleep obtained from the statistics students be a reasonable value to expect for the sample mean of a random sample of 190 adults? Explain.
c. Can the sample taken in the statistics class be considered to be a representative sample of all adults? Explain.
According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probability distribution with a mean $45,000 and a standard deviation of $3,000.
A City Survey states that 70 percent of all business owners favor increasing the parking fees. The city has commissioned a random sample of n = 100 business owners.
in a poll of n 200 randomly selected individuals 60 people said they are opposed to the death penalty for persons
Effect of Screening Mammography on Breast-Cancer Incidence
Driverless vehicles can be used in warehouses, airports, and many other applications. These vehicles follow a wire embedded in the floor and adjust the steerable front wheels in order to maintain proper direction, as shown in Figure P8.7 (a) [10].
In the binomial example with Melissa Bailey, what is the probability that she will be gone six or more weekends?
We are interested in determining if there is any significant difference between the average expenditures of those who visited the two cities?
A.) What is the probability that a random sample of 36 starting salaries of men who graduated last year would have a sample mean at least as large as 32200? B.) Based on your answer to part (a) does it appear that the starting salaries of women s..
a survey of 1305 people who took trips revealed that 96 of them included a visit to a theme park. based on those survey
A clinical investigator is interested in understanding the relationship between demographic factors and congestive heart failure, measured by a cardiac index (CI).
every year the cdc conducts phone surveys to assess the health risks of people in the u.s. this survey is abbreviated
a. Approximately what proportion of overweight children has left atrial diameters less than 25 mm? b. Approximately what proportion of overweight children has left atrial diameters greater than 32 mm?
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