A researcher wants to estimate how many hours per week students who love off campus spend...
A professor wants to estimate how many hours per week her students study. A simple random sample of 56 students had a mean of 19 hours of studying per week. Construct a 98% confidence interval for the mean number of hours a student studies per week. Assume that the population standard deviation is known to be 2.4 hours per week. Round to two decimal places.
A researcher wants to determine a 99% confidence interval for the mean number of hours that adults spend per week doing community service. How large a sample should the researcher select so that the estimate is within 1.4 hours of the population mean? Assume that the standard deviation for time spent per week doing community service by all adults is 3 hours.
9.1.45-1 Jane wants to estimate the proportion of students on her campus who eat cauliflower. After surveying 39 students, she finds 4 who eat cauliflower. Obtain and interpret a 90% confidence interval for the proportion of students who eat cauliflower on Jane's campus using Agresti and Coull's method. - Click the icon to view Agresti and Coull's method. Construct and interpret the 90% confidence interval. Select the correct choice below and fill in the answer boxes within your choice. (Round...
#6 Jane wants to estimate the proportion of students on her campus who eat cauliflower. After surveying 33 students, she finds 3 who eat cauliflower. Obtain and interpret a 90% confidence interval for the proportion of students who eat cauliflower on Jane's campus using Agresti and Coull's method. LOADING... Click the icon to view Agresti and Coull's method. Construct and interpret the 90% confidence interval. Select the correct choice below and fill in the answer boxes within your choice. (Round...
Jane wants to estimate the proportion of students on her campus who eat cauliflower. After surveying 15 students, she finds 2 who eat cauliflower. Obtain and interpret a 95% confidence interval for the proportion of students who eat cauliflower on Jane's campus using Agresti and Coull's method. Construct and interpret the 95% confidence interval. One is 95% confident that the poplulation of students who eat cauliflower on janes campus is between___and ____? *Use the corrent z store interval for 95%...
A computer company wants to estimate the hours per week adults use computers at home. In a random sample of 31 adults, the mean length of time a computer was used at home was 5.3 hours. From past studies the company assumes that σ = 0.9 hours. Construct the 90% confidence interval for the population mean. (Round confidence interval values to two decimal places.)
QUESTION 5 In order to determine how many hours per week freshmen college students watch television, a random sample of 256 students was selected. It was determined that the students in the sample spent an average of 14 hours with a standard deviation of 3.6 hours watching TV per week. a. Provide a 95% confidence interval estimate for the average number of hours that all college freshmen spend watching TV per week. Assume that a sample of 66 students was...
significance level is .05 10. Towson University wants to estimate how many hours per week students work at paying jobs. How many students do they need to survey, in order to have an estimate, to within a half hour, the mean number of hours a TU student works per week? Assume that in a survey done five years ago, the sample standard deviation was.42 hours. 10. Towson University wants to estimate how many hours per week students work at paying...
1. To determine the average number of hours spent studying by college students per week, a sample of 39 students was randomly selected, and found to spend an average of 17.1 hours per week, with a standard deviation of 4.3 hours. Find the 90% confidence interval for the mean number of hours spent studying per week by all college students. What is the upper and lower bound? 2. If I asked a random student how many hours they study per...
a-c please 3. In order to determine how many hours per week freshmen college students watch television, a random sample of 25 students was selected. It was determined that the students in the sample spent an average of 19.5 hours with a sample standard deviation of 3.9 hours watching TV per week. Please answer the following questions: (a) Provide a 95% confidence interval estimate for the average number of hours that all college freshmen spend watching TV per week. (b)...