A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 300 students was x⎯⎯⎯x¯ = 149 minutes. Suppose that we know that the study time follows a Normal distribution with standard deviation σσ = 65 minutes in the population of all first-year students at this university.
Use the survey result to give a 96% confidence interval for the mean study time of all first-year students.
A class survey in a large class for first-year college students asked, "About how many minutes...
A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 274 students was x ¯ ¯ ¯ x¯ = 144 minutes. Suppose that we know that the studey time follows a Normal distribution with standard deviation σ σ = 65 minutes in the population of all first-year students at this university. Regard these students as an SRS from the population of all...
A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 451 students was x¯¯¯x¯ = 15 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 9 hours in the population of all first-year students at this university. What is the 99% confidence interval (±±0.001) for the population mean? Confidence interval is from_____ to ____ hours.
16.19) A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 452 students was x¯¯¯ = 13 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 7 hours in the population of all first-year students at this university. What is the 99% confidence interval (±0.001) for the population mean? Confidence interval is from to hours.
(16.19) A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 434 students was x¯¯¯x¯ = 12 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 8 hours in the population of all first-year students at this university. What is the 99% confidence interval (±±0.001) for the population mean? Confidence interval is from ___to ___...
(16.19) A class survey in a large class for first-year college students asked, About how many hours do you study during a typical week? The mean response of the 463 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours in the population of all first-year students at this university. Step 1: Use the survey result to give a 99% confidence interval for the mean...
5. When a very large STAT 200v class was surveyed and asked, "About how many hours do you study during a typical week?" The mean response of 450 students were x = 13 hours. Supposed that we know that the study time follows a normal distribution with standard deviation o = 7.4 hours in the population of all STAT 2000 students at this University. a. Use the survey result to give a 99% confidence interval for the mean study time...
4. A survey asked a random sample of 363 first-year students how many hours they studied during a particular week. The mean was 15.3 hours. Suppose we know that the population standard deviation is 8.5 hours. Construct a 90%, 95% and 99% confidence interval for the mean study time of all first year students at this university. Interpret the 90% confidence interval.
Question 5 0.33 pts A survey asked the following question: "About how much time (in minutes) do you study on a typical weeknight?" to a randomly selected group of 46 first-year ASU students. The sample mean was 118 minutes. Let u be the mean study time of all first-year ASU students. Assume the population standard deviation is o = 65 minutes. Suppose you wanted to test is u is less than 2 hours: HO: u = 120 Ha: u <120...
7. A survey of first-year and second-year students at a large university asked if students were satisfied with college life. We are interested in whether there is a difference between first and second-year students with respect to this question. You performed a hypothesis test and found there was no evidence of a difference between first and second-year students in response to this question. You based th on a test using alpha -0.01. Would you have made the same decision at...
A survey of 154 students is selected randomly on a large university campus. They are asked if they use a laptop in class to take notes. The result of the survey is that 77 of the 154 students responded "yes." An approximate 98% confidence interval is (0.406, 0.594). Complete parts a through d below. a) How would the confidence interval change if the confidence level had been 90% instead of 98%? The new confidence interval would be ▼ wider. narrower....