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7. (10pts) In a study of student loan subsidies, I surveyed 20 students. In this sample,...
Spring break can be a very expensive holiday. A sample of 95 students is surveyed, and...
Spring break can be a very expensive holiday. A sample of 95 students is surveyed, and the average amount spent by students on travel and beverages is $593.84. The sample standard deviation is approximately $369.34. Construct a 90% confidence interval for the population mean amount of money spent by spring breakers.
A researcher surveys middle-school students on their study habits. She finds that in a random sample...
A researcher surveys middle-school students on their study habits. She finds that in a random sample of 28 middle-school students, the mean amount of time that they spend working on the computer each night is 2.4 hours with a standard deviation of 0.92 hours. She uses the sample statistics to compute a 95% confidence interval for the population mean - the the mean amount of time that all middle-school students spend working on the computer each night. What is the...
The student affairs office of a public university wishes to study absenteeism among students at the...
The student affairs office of a public university wishes to study absenteeism among students at the School of Business during the semester. A random sample of 100 business students reveals the following: •Absenteeism: mean = 9.7 classes & standard deviation = 8.0 classes •48 business studentswere absent more than 5 classes a.Construct a 95% confidence interval estimate of the population mean number of absences for business students during the semester. b.Construct a 90% confidence interval estimate of the population proportion...
A researcher surveys middle-school students on their study habits. She finds that in a random sample...
A researcher surveys middle-school students on their study habits. She finds that in a random sample of 28 middle-school students, the mean amount of time that they spend working on the computer each night is 2.4 hours with a standard deviation of 0.92 hours. She uses the sample statistics to compute a 95% confidence interval for the population mean - the the mean amount of time that all middle-school students spend working on the computer each night. What is the...
Homework #7 - Chapter 14815 (20pts for turned in on time) 9. (10pts) in a study...
Homework #7 - Chapter 14815 (20pts for turned in on time) 9. (10pts) in a study of breaking performance, a tire manufacturer measured the stopping distance for one of the tire models (Model A). On a test track, a car will make sudden stop at a speed of 60 miles per hour, and the distance in feet) is measured after the car made a complete stop. There are 8 set of tires being tested, and the data is shown below:...
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students...
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #) ii)
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students...
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval ii) Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #)
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students...
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval ii) Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #)
9. A group of statistics students decided to conduct a survey at their university to find...
9. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of three hours, what is the required sample size if the error should be less than a half hour with a 99% level of confidence? 10.University officials say that at least 70% of the voting student population supports a fee increase. If the 95% confidence interval estimating the...
A questionnaire about study habits was given to a random sample of high school students. The...
A questionnaire about study habits was given to a random sample of high school students. The sample of 20 students reported that they spent an average of 215 minutes per week studying with a standard deviation of 70 minutes. What is your 95% confidence interval on the population variance?
Homework #7 - Chapter 14815 (20pts for turned in on time) 9. (10pts) in a study of breaking performance, a tire manufacturer measured the stopping distance for one of the tire models (Model A). On a test track, a car will make sudden stop at a speed of 60 miles per hour, and the distance in feet) is measured after the car made a complete stop. There are 8 set of tires being tested, and the data is shown below:...
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #) ii)
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval ii) Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #)
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval ii) Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #)
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