A random sample of 48 students at a large university reported getting an average of 7...
A random sample of 48 students at a large university reported getting an average of 7 hours of sleep on weeknights, with standard deviation 1.62 hours.It is recommended, for most college age students, to get 8 hours of sleep each night. Does this sample provide evidence that college students at this university get significantly less sleep, on average, than what is recommended? a.Does the scenario represent a confidence interval or a hypothesis test?b.Does the scenario represent a one population or two populations?c.What is the appropriate formula for this scenario?d.What does each symbol represent in the appropriate formula?
Homework Answers
a)
the scenario represent a hypothesis test
b)
the scenario represent a one population
c)
t = (xbar - mu)/(s/sqrt(n))
d)
xbar = sample mean
mu = population mean
s = sample mean
n = sample size
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A random sample of 48 students at a large university reported
getting an average of 7...
show work please Problem 2: Use the following to answer questions a)-e): A random sample of...
show work please
Problem 2: Use the following to answer questions a)-e): A random sample of 48 students at a large university reported getting an average of 7 hours of sleep on weeknights, with standard deviation 1.62 hours. A dotplot of the data is provided. 9.6 Weekniaht Sleep a. Briefly explain why it is reasonable to use a t-distribution to perform inference about the mean amount of weeknight sleep for students at this university. (2 points) The research question: It...
shoe work please Problem 2: Use the following to answer questions a) – e): A random...
shoe work please
Problem 2: Use the following to answer questions a) – e): A random sample of 48 students at a large university reported getting an average of 7 hours of sleep on weeknights, with standard deviation 1.62 hours. A dotplot of the data is provided. 0 4.8 5.6 8.8 9.6 6.4 7.2 8.0 Weeknight Sleep a. Briefly explain why it is reasonable to use a t-distribution to perform inference about the mean amount of weeknight sleep for students...
More than 100 million people around the world are not getting enough sleep; the average adult...
More than 100 million people around the world are not getting
enough sleep; the average adult needs between 7.5 and 8 hours of
sleep per night. College students are particularly at risk of not
getting enough shut-eye. A recent survey of several thousand
college students indicated that the total hours of sleep time per
night, denoted by the random variable X, can be approximated by a
normal model with E(X) = 6.94 hours and SD(X) = 1.23 hours.
Question 1....
A random sample of 85 students finds that they, on average, they get 6.5 hours of...
A random sample of 85 students finds that they, on average, they get 6.5 hours of sleep a night, with a sample standard deviation of 7 hours. Would you use the z-distribution or the t-distribution to construct a confidence interval? How do you know? Construct a 95% confidence interval for the population mean. How do you interpret this interval? Is it likely that students actually get 7 hours of sleep a night? How can you tell?
A professor at a university wants to estimate the average number of hours of sleep students...
A professor at a university wants to estimate the average number of hours of sleep students get during exam week. On the first day of exams, she asked 27 students how many hours they had slept the night before. The average of the sample was 3.79 with a standard deviation of 1.224. When estimating the average amount of sleep with a 99% confidence interval, what is the margin of error? 1) 0.3549 2) 0.6546 3) 0.5839 4) 0.2356 5) 0.6527
More than 100 million people around the world are not getting enough sleep; the average adult...
More than 100 million people around the world are not getting enough sleep; the average adult needs between 7.5 and 8 hours of sleep per night. College students are particularly at risk of not getting enough shut-eye. A recent survey of several thousand college students indicated that the total hours of sleep time per night, denoted by the random variable X, can be approximated by a normal model with E(X) 6.9 hours and SD(X)-1.2 hours. Question 1. Find the probability...
More than 100 million people around the world are not getting enough sleep; the average adult...
More than 100 million people around the world are not getting enough sleep; the average adult needs between 7.5 and 8 hours of sleep per night. College students are particularly at risk of not getting enough shut-eye. A recent survey of several thousand college students indicated that the total hours of sleep time per night, denoted by the random variable X, can be approximated by a normal model with E(X) = 6.68 hours and SD(X) = 1.26 hours. Question 1....
Chpt 6 A study by Stanford University concluded that 45% of college students sleep at least...
Chpt 6 A study by Stanford University concluded that 45% of college students sleep at least 8 hours per night. In a sample of 10 DCCC students, find the probability that at least 8 of the 10 get 8 or more.
3. Suppose a random sample of 300 U.S. college students was obtained and the average number...
3. Suppose a random sample of 300 U.S. college students was obtained and the average number of hours of sleep per night for each individual was determined. It was then determined that those students who averaged at least 7 hours of sleep per night had a higher cumulative gpa, on average, than those who did not Define the following: (a) The population(s) of interest.(The independent variables) (b) The variable measured.(The dependent variable). Is this an observational study or experiment? (c)...
A random sample of community college students was asked the number of hours they sleep on...
A random sample of community college students was asked the number of hours they sleep on a typical week-night during a given academic term. The sample data are as follows: 8 6 4 5 3 7 S 4 3 4 4 5 6 8 7 7 7 3 3 4 What is the 90% confidence interval estimate for the true mean amount of sleep time per night spent by community college students during a academic term? a) The data give...
show work please
Problem 2: Use the following to answer questions a)-e): A random sample of 48 students at a large university reported getting an average of 7 hours of sleep on weeknights, with standard deviation 1.62 hours. A dotplot of the data is provided. 9.6 Weekniaht Sleep a. Briefly explain why it is reasonable to use a t-distribution to perform inference about the mean amount of weeknight sleep for students at this university. (2 points) The research question: It...
shoe work please
Problem 2: Use the following to answer questions a) – e): A random sample of 48 students at a large university reported getting an average of 7 hours of sleep on weeknights, with standard deviation 1.62 hours. A dotplot of the data is provided. 0 4.8 5.6 8.8 9.6 6.4 7.2 8.0 Weeknight Sleep a. Briefly explain why it is reasonable to use a t-distribution to perform inference about the mean amount of weeknight sleep for students...
More than 100 million people around the world are not getting
enough sleep; the average adult needs between 7.5 and 8 hours of
sleep per night. College students are particularly at risk of not
getting enough shut-eye. A recent survey of several thousand
college students indicated that the total hours of sleep time per
night, denoted by the random variable X, can be approximated by a
normal model with E(X) = 6.94 hours and SD(X) = 1.23 hours.
Question 1....
More than 100 million people around the world are not getting enough sleep; the average adult needs between 7.5 and 8 hours of sleep per night. College students are particularly at risk of not getting enough shut-eye. A recent survey of several thousand college students indicated that the total hours of sleep time per night, denoted by the random variable X, can be approximated by a normal model with E(X) 6.9 hours and SD(X)-1.2 hours. Question 1. Find the probability...
3. Suppose a random sample of 300 U.S. college students was obtained and the average number of hours of sleep per night for each individual was determined. It was then determined that those students who averaged at least 7 hours of sleep per night had a higher cumulative gpa, on average, than those who did not Define the following: (a) The population(s) of interest.(The independent variables) (b) The variable measured.(The dependent variable). Is this an observational study or experiment? (c)...
A random sample of community college students was asked the number of hours they sleep on a typical week-night during a given academic term. The sample data are as follows: 8 6 4 5 3 7 S 4 3 4 4 5 6 8 7 7 7 3 3 4 What is the 90% confidence interval estimate for the true mean amount of sleep time per night spent by community college students during a academic term? a) The data give...
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