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The distribution of hours of sleep per week night, among college students, is found to be...
mal 3-27 nia l- 8-6-4 -2 0 2 468 10 12 FIGURE 3.15 A Normal curve, for Exercises 3.17 and 3.18. 3.19 The distribution of hours of sleep per week 3.2 among college students, is found to be Normall tributed, with a mean of 6.5 hours and a standard d ation of 1 hour. What range contains the middle 9s of hours slept per week night by college students? (a) 5.5 and 7.5 hours per week night y & des,...
College students average 7.8 hours of sleep per night with a standard deviation of 45 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 9 hours?
(1 point) College students average 7.2 hours of sleep per night with a standard deviation of 35 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 8 hours? Proportion =
In a recent survey, the total sleep time per night among college students was approximately Normally distributed with mean μ = 6.72 hours and standard deviation σ 1.24 hours. You plan to take an SRS of size n-150 and compute the average total sleep time. (a) What is the standard deviation for the average time? (Round your answer to three decimal places.) 101 hours (b) Use the 95 part of the 68-95-99.7 rule to describe the variability of this sample...
Total sleep time of college students. A recent survey describes the distribution of total sleep time among college students as approximately Normal with a mean of 6.78 hours and standard deviation of 1.24 hours.3 Suppose that we select a college student at random and obtain his or her sleep time. This result is a random variable X because, prior to the random sampling, we don't know the sleep time. We do know, however, that in repeated sampling, X will have...
It is recommended that adults get 8 hours of sleep each night. A researcher hypothesized college students got less than the recommended number of hours of sleep each night, on average. The researcher randomly sampled 20 college students and calculated a sample mean of 7.5 hours per night. If the researcher wanted to perform a one-sample t-test, which of the following is a correct statement? Choose the correct answer below. A. The distribution of sample means will be normal even...
Normal distribution: Problem 10 Previous Problem ListNext (1 point) College students average 7.2 hours of sleep per night with a standard deviation of 35 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 8.5 hours? Probability - el Preview My Answers Submit Answers You have attempted this problem 0 times You have unlimited attempts remaining Email instructor /h
A scientific study was conducted to determine the hours of sleep that college students get per night. The college students surveyed slept an average of 7.8 hours per night. The margin of error of the survey was 0.5 hours. Construct a confidence interval for the average hours of sleep per night that college students get.
The number of hours of sleep each student gets per night is approximately normally distributed with mean of 7 hours and standard deviation of 1.25 hours. (c) Cognitive functioning drops off dramatically without enough sleep. Suppose that Health Services wants to help the students who sleep the least. Due to budget constraints, they will focus their efforts on students who are in the bottom 5% of hours slept. At what number of hours should they focus their efforts?
Univeristy of Calagary's students average 60 hours of sleep per week. Sleep is a normally distributed variable with a standard deviation of 6 hours per week. Determine the amount of sleep that is exceeded by no more than 2.5% of students.