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4. Suppose the number of students who come to office hours on the ith day is modeled as a random ...
A random sample of 46 college students reported the number of hours per day they typically spend on social media. Their...
A random sample of 46 college students reported the number of hours per day they typically spend on social media. Their sample mean is, M = 2.61, and their standard deviation is, s = 1.02. If you plan to construct a 95% confidence interval for the population mean, what t critical value should you use based on this data?
Based on a random sample of 20 students from a PE class, they exercise 1.6 hours...
Based on a random sample of 20 students from a PE class, they exercise 1.6 hours (96 minutes) per day on average with sample standard deviation 1.23 hours (78 minutes). Use this information to construct a 95% confidence interval to estimate μ, the population mean number of hours of daily exercise for students. a. State the assumption(s) b. identify whether each assumption is met or not. c. Show your work to calculate the confidence interval and d. interpret the result in...
A random sample of 46 college students reported the number of hours per day they typically...
A random sample of 46 college students reported the number of hours per day they typically spend on social media. Their sample mean is, M = 2.61, and their standard deviation is, s = 1.02. What is the point estimate of the mean time spent per day on social media for the population of college students?
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...
A researcher wants to estimate how many hours per week students who love off campus spend...
A researcher wants to estimate how many hours per week students who love off campus spend driving to campus. A simple random sample of 84 students had a mean of 5.0 hours of driving. Construct and interpret a 90% confidence interval for the mean number of hours a student drives per week. Assume the population standard deviation is known to be 0.3 hours per week.
You are to estimate the average number of hours that students who are planning to enroll...
You are to estimate the average number of hours that students who are planning to enroll at a college in the fall semester will be taking. You don’t know the standard deviation (or variance), but from previous semesters you have an idea about the range. Historically, the lowest number of hours taken is 1 (usually a PE course). At the other end of the spectrum, the most hours a student has ever been enrolled for is 24. Using industry convention,...
Suppose data about the average number of hours people spend on social media websites at work...
Suppose data about the average number of hours people spend on social media websites at work is randomly collected for 5 days: 4, 4.5, 2.5, 2, 6 A.) If we assume this population is normally distributed, construct an 80% confidence interval for the population average amount of time people spend on social media websites at work. B.) Suppose I want to know more about how workers spend their time throughout the day. I want to test the claim that people...
Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia....
Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep hours. A random sample of 18 commercial airline pilots was interviewed, and the pilots in the sample reported the time at which they went to sleep on their most recent working day. The study gave the sample mean and standard deviation of the times reported by pilots, with these...
1.) Tire Kingdom installs automobile tires on a first-come-first-served basis. A random sample of 45 customers...
1.) Tire Kingdom installs automobile tires on a first-come-first-served basis. A random sample of 45 customers experienced an average wait time of 90.5 minutes. Assume that the standard deviation of the total wait time for all customers is 20.6 minutes. Determine the 95% confidence interval for this sample. 2.) The success of the Facebook business model depends on users clicking on ads when using the web site. A random sample of 260 Facebook users found that 169 of them click...
It is known that nationally, students attending four-year colleges get an average of 6.75 hours of...
It is known that nationally, students attending four-year colleges get an average of 6.75 hours of sleep per night, with a standard deviation of 1.7 hours. You are interested in seeing if students who attend commuter colleges (colleges where students must commute to school because there are no dorms on campus), such as John Jay College of Criminal Justice, differ significantly from this national average. Complete the following steps in order: What are the population mean and population standard deviation?...
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...
Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep hours. A random sample of 18 commercial airline pilots was interviewed, and the pilots in the sample reported the time at which they went to sleep on their most recent working day. The study gave the sample mean and standard deviation of the times reported by pilots, with these...
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