suppose that the amount of time a teenagers spend on the internet is normally distributed with...
suppose that the amount of time a teenagers spend on the internet is normally distributed with a standard deviation of 1.5 hours. A sample of 100 teenagers is selected at random, and the sample mean computed as 6.5 hours.
a. determine the 95% confidence interval estimate of the population mean.
b. interpret what the confidence interval estimate tells you.
Homework Answers
Add Answer to:
suppose that the amount of time a teenagers spend on the
internet is normally distributed with...
2. Suppose that the amount of time teenagers spend working at part-time jobs is normally distributed...
2. Suppose that the amount of time teenagers spend working at part-time jobs is normally distributed with a standard deviation of 20 minutes. A random sample of 100 observations is drawn, and the sample mean computed as 120 minutes. Determine the 95% confidence interval estimate of the population mean.
2. Suppose that the amount of time teenagers spend weekly working at part-time jobs is normally distributed with a stan...
2. Suppose that the amount of time teenagers spend weekly working at part-time jobs is normally distributed with a standard deviation of 40 minutes. A random sample of 15 teenagers was drawn, and each reported the amount of time spent at part-time jobs (in minutes). These are listed here. Determine and interpret the 95% confidence interval estimate of the average amount of time spent working weekly at part-time jobs of all teenagers. 180 130 150 165 90 130 120 60200...
all answers please 3. The teachers union is concerned about the amount of time teachers spend...
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
Suppose that the wait times for patients in an emergency room are normally distributed with an...
Suppose that the wait times for patients in an emergency room are normally distributed with an unknown mean and standard deviation. A random sample of 18 patients is taken and gives a sample mean of 25 minutes and a sample standard deviation of 2 minutes. As found above, the EBM, margin of error, for a 95% confidence interval estimate for the population mean using the Student's t-distribution is 0.99. Find a 95% confidence interval estimate for the population mean using...
in order to estimate the mean amount of time computer users spend on the internet each...
in order to estimate the mean amount of time computer users spend on the internet each month, how many computers users must be surveyed in order to be 95% confidence that your sample mean is within 13 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 218 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated...
Suppose that the lifetimes of light bulbs are approximately normally distributed. A random sample with 38...
Suppose that the lifetimes of light bulbs are approximately normally distributed. A random sample with 38 light bulbs was obtained with a mean of 60 hours and a standard deviation of 4.5 hours. With this information, answer the following questions. To estimate the population mean, what is the Standard Error? To estimate the population mean at 95% C.L., what is the Margin of Error? At a 96% C.L., if the researcher wants to limit the margin of error within 0.5...
all answers please!! 1. A company that produces brendis concerned about the distribution of the amount of sodiu...
all answers please!!
1. A company that produces brendis concerned about the distribution of the amount of sodium in its bread. The company takes a simple random sample of 100 slices of bread and compute the sample mean to be 103 milligrams of sodium per slice. Assume that the population standard deviation is 10 milligrams a) Construct a 95% confidence interval estimate for the mean sedium level. b) Construct a 99% confidence intervalestime for the mean sodium level. 2. Fill...
1. (19 pt) A sample of 25 individuals from a normally distributed population reported a sample me...
1. (19 pt) A sample of 25 individuals from a normally distributed population reported a sample mean of 6.86 hours of sleep per night and a sample standard deviation of 0.78. (Make sure to show all work.) a. What is the 90%,confidenceinterval estimate for the population mean? b. What is the 95% confidence interval estimate for the population mean? c. What is the 99% confidence interval estimate for the population mean? d. A sample taken the previous year had a...
Suppose a random sample of size 17 was taken from a normally distributed population, and the...
Suppose a random sample of size 17 was taken from a normally distributed population, and the sample standard deviation was calculated to be s = 5.0. a) Calculate the margin of error for a 95% confidence interval for the population mean. Round your response to at least 3 decimal places. b) Calculate the margin of error for a 90% confidence interval for the population mean. Round your response to at least 3 decimal places.
In a survey of 28 teenagers who were asked how many hours per week they spend...
In a survey of 28 teenagers who were asked how many hours per week they spend watching T.V., the sample mean was 13 hours and the population standard deviation is 5.8 hours. Find a 99% Confidence Interval for the population mean number of hours teenagers watch T.V. Write the interval below. Write a sentence interpreting this. (Round answer to 2 decimal places)
2. Suppose that the amount of time teenagers spend working at part-time jobs is normally distributed with a standard deviation of 20 minutes. A random sample of 100 observations is drawn, and the sample mean computed as 120 minutes. Determine the 95% confidence interval estimate of the population mean.
2. Suppose that the amount of time teenagers spend weekly working at part-time jobs is normally distributed with a standard deviation of 40 minutes. A random sample of 15 teenagers was drawn, and each reported the amount of time spent at part-time jobs (in minutes). These are listed here. Determine and interpret the 95% confidence interval estimate of the average amount of time spent working weekly at part-time jobs of all teenagers. 180 130 150 165 90 130 120 60200...
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
all answers please!!
1. A company that produces brendis concerned about the distribution of the amount of sodium in its bread. The company takes a simple random sample of 100 slices of bread and compute the sample mean to be 103 milligrams of sodium per slice. Assume that the population standard deviation is 10 milligrams a) Construct a 95% confidence interval estimate for the mean sedium level. b) Construct a 99% confidence intervalestime for the mean sodium level. 2. Fill...
1. (19 pt) A sample of 25 individuals from a normally distributed population reported a sample mean of 6.86 hours of sleep per night and a sample standard deviation of 0.78. (Make sure to show all work.) a. What is the 90%,confidenceinterval estimate for the population mean? b. What is the 95% confidence interval estimate for the population mean? c. What is the 99% confidence interval estimate for the population mean? d. A sample taken the previous year had a...
Most questions answered within 3 hours.
-
Aside from commercial tools that are specifically geared toward
TAR/PC( Technology-Assisted Review), are there potential
alternative...
asked 47 seconds ago -
the period of a pendulum on earth is 5 seconds. what will be the
period of...
asked 16 minutes ago -
The
act of turning media against itself, such as flash mobs and
billboard is called
a....
asked 12 minutes ago -
A set of length measurements are obtained with the values 165.6
± 0.3, 165.1± 0.4,166.4± 1.0,...
asked 13 minutes ago -
Vertical Analysis
Income statement information for Einsworth Corporation
follows:
Sales
$237,000
Cost of goods sold
78,210...
asked 20 minutes ago -
A simple random sample was taken to test the claim that the
population mean is no...
asked 15 minutes ago -
Overview
JAVA LANGUAGE PROBLEM:
The owner of a restaurant wants a program to manage online
orders...
asked 20 minutes ago -
1- What is “progressive production?”
2- Where did the assembly line originate? (Name the industry)
3....
asked 18 minutes ago -
NPV
Project L costs $60,000 it’s expected cash inflows are $13,000
per year for 10 years,...
asked 23 minutes ago -
What would you expect the observed boiling point to be at 10
torrs of a liquid...
asked 31 minutes ago -
write a javascript jquery code to display calendar and let it be
sticked on the textbox...
asked 38 minutes ago -
A Call Spread is
A.
The simultaneous purchase of a call and
sale of a put...
asked 38 minutes ago