The number of hours of sleep in a night is normally distributed in adults, with a...
The number of hours of sleep in a night is normally distributed in adults, with a mean of 7.2 hours and a standard deviation of 1.7 hours. Suppose a randomly selected adult sleeps 7.3 hours in a night. What percentile are they - that is, what percentage of adults do they sleep more than?
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The number of hours of sleep in a night is normally distributed
in adults, with a...
The number of hours adults sleep per night is normally distributed with a mean of 7.3...
The number of hours adults sleep per night is normally distributed with a mean of 7.3 hours. Aussum that the standard devation is unknown. question: if 70% of adults sleep more than 6.5 hours per night, what is the variance? (remember the label)
The results of a national survey showed that on average, adults sleep 6.7 hours per night....
The results of a national survey showed that on average, adults sleep 6.7 hours per night. Suppose that the standard deviation is 1.9 hours and that the number of hours of sleep follows a bell-shaped distribution. If needed, round your answers to two decimal digits. (a) Use the empirical rule to calculate the percentage of individuals who sleep between 2.9 and 10.5 hours per day. Enter your answer as a percentage. (b) What is the z-value for an adult who...
The number of sleep hours for adults is normally distributed with mean 7 hours and standard...
The number of sleep hours for adults is normally distributed with mean 7 hours and standard deviation 1.7 hours. How large a sample should be selected if we we wish our estimate to be correct within 30 minutes with 95% confidence? a) 44 b)45 c)12 d)11
The results of a national survey showed that on average, adults sleep 6.6 hours per night....
The results of a national survey showed that on average, adults sleep 6.6 hours per night. Suppose that the standard deviation is 1 hour and that the number of hours of sleep follows a bell-shaped distribution. If needed, round your answers to two decimal digits. If your answer is negative use "minus sign". (a) Use the empirical rule to calculate the percentage of individuals who sleep between 4.6 and 8.6 hours per day. Enter your answer as a percentage. (b)...
the amount of sleep per night of us.adults follows a normal distribution with mean 7.5 hours...
the amount of sleep per night of us.adults follows a normal distribution with mean 7.5 hours and A lot of research is conducted on the sleeping habits of US adults. One study reported that standard de 12 hours Question 1 1 The shaded area in the image below represents which of the follow n PXX-5 PSX9.5) PEX- S X 9.5) PX X5 Question 14 of 18 Using the Standard Deviation Rule, what is the probability that a randomly chosen U.S....
The number of hours of sleep each student gets per night is approximately normally distributed with...
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?
1. The time needed to complete a final examination in a particular college course is normally distributed with a mean o...
1. The time needed to complete a final examination in a particular college course is normally distributed with a mean of 83 minutes and a standard deviation of 13 minutes. Answer the following questions. a. What is the probability of completing the exam in one hour or less (to 4 decimals)? b. What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes (to 4 decimals)? 2. According to the...
The recommended number of hours of sleep per night is 8 hours, but everybody knows that...
The recommended number of hours of sleep per night is 8 hours, but everybody knows that the average college student sleeps less than 7 hours. The number of hours slept last night by 10 randomly selected college students is listed below. Complete the following hypothesis test: He: -7,<7, = 0.05. 6.2 7.5 6.6 5.7 6.1 6.1 7.2 6.1 7.3 6.5 (a) Find t. (Give your answer correct to two decimal places.) (11) Find the p-value. (Give your answer correct to...
(1 point) College students average 7.2 hours of sleep per night with a standard deviation of...
(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 =
The average adult is supposed to get 8 hours of sleep a night. A "sleep habits"...
The average adult is supposed to get 8 hours of sleep a night. A "sleep habits" survey answered by 28 randomly selected New Yorkers contained the question "How much sleep do you get per night?" The sample average was 7.75 hours, with a corresponding sample standard deviation of 0.8 hours. Conduct a hypothesis test to see if there is evidence that New Yorkers (who live, after all, in "the city that never sleeps") on average get less than 8 hours...
The results of a national survey showed that on average, adults sleep 6.6 hours per night. Suppose that the standard deviation is 1 hour and that the number of hours of sleep follows a bell-shaped distribution. If needed, round your answers to two decimal digits. If your answer is negative use "minus sign". (a) Use the empirical rule to calculate the percentage of individuals who sleep between 4.6 and 8.6 hours per day. Enter your answer as a percentage. (b)...
the amount of sleep per night of us.adults follows a normal distribution with mean 7.5 hours and A lot of research is conducted on the sleeping habits of US adults. One study reported that standard de 12 hours Question 1 1 The shaded area in the image below represents which of the follow n PXX-5 PSX9.5) PEX- S X 9.5) PX X5 Question 14 of 18 Using the Standard Deviation Rule, what is the probability that a randomly chosen U.S....
The recommended number of hours of sleep per night is 8 hours, but everybody knows that the average college student sleeps less than 7 hours. The number of hours slept last night by 10 randomly selected college students is listed below. Complete the following hypothesis test: He: -7,<7, = 0.05. 6.2 7.5 6.6 5.7 6.1 6.1 7.2 6.1 7.3 6.5 (a) Find t. (Give your answer correct to two decimal places.) (11) Find the p-value. (Give your answer correct to...
(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 =
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