A random sample of 240 College students was asked how much time they spend weekly playing...
A random sample of 240 College students was asked how much time they spend weekly playing video games in hours. The sample had a mean of 7.7 hours weekly, and suppose it is known that time spent playing video games has a standard deviation of 1.6 hours weekly. What sample size would I need if I wanted a margin of error of 0.25 hours for a 99% confidence interval?
Homework Answers
Add Answer to:
A random sample of 240 College students was asked how much time
they spend weekly playing...
A random sample of 51 college students shows that they spend, on average, 4.5 hours on...
A random sample of 51 college students shows that they spend, on average, 4.5 hours on video games every night, with a standard deviation of 1.25 hours. Construct a 98% confidence interval to estimate the mean number of hours that college students spend on video games every nigh
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 sample of 200 college freshmen was asked how many hours per week they spent playing...
A sample of 200 college freshmen was asked how many hours per week they spent playing video games. The following frequency distribution presents the results. Number of Hours Frequency 1.0- 3.9 20 4.0- 6.9 32 7.0- 9.9 47 10.0- 12.9 28 13.0- 15.9 24 16.0- 18.9 18 19.0- 21.9 12 22.0- 24.9 7 25.0- 27.9 4 28.0- 30.9 8 1) What is the class width? 2) What percentage of students play video games for less than 19 hours per week?...
A survey is done to check how much time students actually spend working on the course...
A survey is done to check how much time students actually spend working on the course outside the class. 29 randomly selected students are asked: "How many hours of schoolwork do you do outside of class for each hour in class?" The sample mean of the 29 respondents is 1.2 hours with a standard deviation of 0.24 hours. 1. What is the standard error of the sample mean x¯x¯? [answer to 3 decimal places] 2. Suppose μμ denotes the population...
A sample of 200 college students are asked about how much time they spend studying for...
A sample of 200 college students are asked about how much time they spend studying for classes each week. The results show that the sample has a mean of 15 hours with a standard deviation of 5 hours. Explain these findings for someone who has never taken a statistics class before. Note that your job is to interpret the findings, NOT to explain how they were calculated! (10 points)
2. Suppose that a random sample of 41 state college students is asked to measure the...
2. Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 90% confidence interval for the mean foot length for students at this university turns out to be (21.709, 25.091). If we now calculated a 95% confidence interval, would the new confidence interval be wider than or narrower than or the same as the original? b. Suppose two researchers want to estimate the proportion of American college...
The mean number of hours of part-time work per week for a sample of 526 college...
The mean number of hours of part-time work per week for a sample of 526 college students is 28. if the margin of error for the population mean with a 99 % confidence interval is 2.2, construct a 99 % confidence interval for the mean number of hours of part-time work per week for all college students.
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...
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...
Based on a random sample of fifty full-time college students, we can be 90% confident that...
Based on a random sample of fifty full-time college students, we can be 90% confident that for all college students the mean time spent studying per week is between 9.25 hours and 10.75 hours. Which interval (a – d) is a 95% confidence interval for the same sample? a. (9.10, 10.90) b. (9.30, 10.70) c. (9.45, 10.55) d. (9.00, 10.50)
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 sample of 200 college students are asked about how much time they spend studying for classes each week. The results show that the sample has a mean of 15 hours with a standard deviation of 5 hours. Explain these findings for someone who has never taken a statistics class before. Note that your job is to interpret the findings, NOT to explain how they were calculated! (10 points)
2. Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 90% confidence interval for the mean foot length for students at this university turns out to be (21.709, 25.091). If we now calculated a 95% confidence interval, would the new confidence interval be wider than or narrower than or the same as the original? b. Suppose two researchers want to estimate the proportion of American college...
The mean number of hours of part-time work per week for a sample of 526 college students is 28. if the margin of error for the population mean with a 99 % confidence interval is 2.2, construct a 99 % confidence interval for the mean number of hours of part-time work per week for all college students.
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...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago