Students who get more sleep get better grades. You want to estimate the hours of sleep...
Students who get more sleep get better grades. You want to estimate the hours of sleep per night that a college student gets. You select 29 students; on average they slept 6.2 hours with a standard deviation of 1.8 hours. The standard error is 0.334. In order to be 90% confident of an estimate of the population mean, what is the critical value?
A- 1.640
B- 1.960
C- 1.699
D- 1.701
E- 2.064
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Students who get more sleep get better grades. You want to
estimate the hours of sleep...
A scientific study was conducted to determine the hours of sleep that college students get per...
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.
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
The distribution of hours of sleep per week night, among college students, is found to be...
The distribution of hours of sleep per week night, among college students, is found to be Normally distributed, with a mean of 6.5 hours and a standard deviation of 1 hour. What range contains the middle 95% of hours slept per week night by college students (a) 5.5 and 7.5 hours per week night (b) 4.5 and 7.5 hours per week night (c) 4.5 and 8.5 hours per week night 3.19
You want to construct a confidence interval for the mean hours of sleep for all college...
You want to construct a confidence interval for the mean hours of sleep for all college students and you want to find the appropriate sample size for some constraints outlined below. Assume you know the population standard deviation (σ) is 1.45 hours. (a) Estimate the sample size required to be 95% confident that the sample mean is within 0.2 hours of the population mean for college students. The minimum sample size is ___ students. (b) Estimate the sample size required...
Suppose we measure how much sleep students in first and second year at UVic get per...
Suppose we measure how much sleep students in first and second year at UVic get per night. A sample of 25 first year students slept an average of 8.4 hours per night with a standard deviation of 1.1 hours. A sample of 18 second year students slept an average of 7.6 hours per night with a standard deviation of 2.3 hours. Suppose we want to test if first year students sleep more than second year students. Assuming the number of...
Suppose we measure how much sleep students in first and second year at UVic get per...
Suppose we measure how much sleep students in first and second year at UVic get per night. A sample of 25 first year students slept an average of 8.4 hours per night with a standard deviation of 1.1 hours. A sample of 18 second year students slept an average of 7.6 hours per night with a standard deviation of 2.3 hours. Suppose we want to test if first year students sleep more than second year students. Assuming the number of...
Suppose we measure how much sleep students in first and second year at UVic get per...
Suppose we measure how much sleep students in first and second year at UVic get per night. A sample of 21 first year students slept an average of 7.9 hours per night with a standard deviation of 1.3 hours. A sample of 16 second year students slept an average of 6.8 hours per night with a standard deviation of 2.1 hours. Suppose we want to test if first year students sleep more than second year students. Assuming the number of...
You are interested in the effect of energy drinks on the amount of hours of sleep...
You are interested in the effect of energy drinks on the amount of hours of sleep students get each night. Specifically, you expect that energy drinks will decrease the average amount of sleep a student gets. To investigate this, you gather a sample of 15 students that drink energy drinks each night for a week and get their average reported hours of sleep per night and compare it to the average amount of sleep for all students. The data are...
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?
A recent article in a college newspaper stated that college students get an average of 5.5...
A recent article in a college newspaper stated that college students get an average of 5.5 hrs of sleep each night. A student who was skeptical about this value decided to conduct a survey by randomly sampling 25 students. On average, the sampled students slept 6.25 hours per night. Identify which value represents the sample mean and which value represents the claimed population mean
The distribution of hours of sleep per week night, among college students, is found to be Normally distributed, with a mean of 6.5 hours and a standard deviation of 1 hour. What range contains the middle 95% of hours slept per week night by college students (a) 5.5 and 7.5 hours per week night (b) 4.5 and 7.5 hours per week night (c) 4.5 and 8.5 hours per week night 3.19
Suppose we measure how much sleep students in first and second year at UVic get per night. A sample of 25 first year students slept an average of 8.4 hours per night with a standard deviation of 1.1 hours. A sample of 18 second year students slept an average of 7.6 hours per night with a standard deviation of 2.3 hours. Suppose we want to test if first year students sleep more than second year students. Assuming the number of...
Suppose we measure how much sleep students in first and second year at UVic get per night. A sample of 21 first year students slept an average of 7.9 hours per night with a standard deviation of 1.3 hours. A sample of 16 second year students slept an average of 6.8 hours per night with a standard deviation of 2.1 hours. Suppose we want to test if first year students sleep more than second year students. Assuming the number of...
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