A professor wants to estimate how many hours per week her students study. A simple random...
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.
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A professor wants to estimate how many hours per week her
students study. A simple random...
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.
A computer company wants to estimate the hours per week adults use computers at home. In...
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.)
The mean number of hours of study time per week for a sample of 524 high-school students is 27. I...
The mean number of hours of study time per week for a sample of 524 high-school students is 27. If the margin of error for the population mean with a 98% confidence interval is 1.7, construct a 98% confidence interval for the mean number of hours of study time per week for all high-school students. Lower endpoint? upper endpoint?
The mean number of hours of study time per week for a sample of 559 students...
The mean number of hours of study time per week for a sample of 559 students is 23. If the margin of error for the population mean with a 99% confidence interval is 1.7, construct a 99% confidence interval for the mean number of hours of study time per week for all students
1. To determine the average number of hours spent studying by college students per week, a...
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...
1. In a recent study of 39 ninth-grade students, the mean number of hours per week...
1. In a recent study of 39 ninth-grade students, the mean number of hours per week that they played video games was 86.6. The standard deviation of the sample was 3.8. a. Find the best point estimate of the population mean. b. Find the 90%confidence interval of the mean of the time playing video games. c. Find the 96% confidence interval of the mean of the time playing video games. d. Find the 98% confidence interval of the mean of...
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 wi...
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...
4. A survey asked a random sample of 363 first-year students how many hours they studied...
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.
An educational research group wants to know how many hours college students spend studying outside of...
An educational research group wants to know how many hours college students spend studying outside of class per week. If they survey 100 students and find an average 10.5 hours of studying a week, with a standard deviation of 2.25, find a 98% confidence interval for the true average number of hours spent studying. Answer choices: 10.5±.324 10.5±.225 None of these 10.5±.482 10.5±.524
QUESTION 5 In order to determine how many hours per week freshmen college students watch television,...
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...
1. In a recent study of 39 ninth-grade students, the mean number of hours per week that they played video games was 86.6. The standard deviation of the sample was 3.8. a. Find the best point estimate of the population mean. b. Find the 90%confidence interval of the mean of the time playing video games. c. Find the 96% confidence interval of the mean of the time playing video games. d. Find the 98% confidence interval of the mean of...
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...
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 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...
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