# Question: According to the Sacramento Bee 2 April 1998 p F5

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 to Figure 19.5, 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.

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 to Figure 19.5, 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.

**View Solution:**## Answer to relevant Questions

Suppose the population of IQ scores in the town or city where you live is bell-shaped, with a mean of 105 and a standard deviation of 15. Describe the frequency curve for possible sample means that would result from random ...Suppose the population of grade-point averages (GPAs) for students at the end of their first year at a large university has a mean of 3.1 and a standard deviation of .5. Draw a picture of the frequency curve for the mean GPA ...According to USA Today ( 20 April 1998, Snapshot), a poll of 8709 adults taken in 1976 found that 9% believed in reincarnation, whereas a poll of 1000 adults taken in 1997 found that 25% held that belief. a. Assuming a ...A university is contemplating switching from the quarter system to the semester system. The administration conducts a survey of a random sample of 400 students and finds that 240 of them prefer to remain on the quarter ...An advertisement for SeldaneD, a (now discontinued) drug prescribed for seasonal allergic rhinitis, reported results of a double-blinda study in which 374 patients took Seldane-D and 193 took a placebo (Time, 27 March ...Post your question