In a survey, 800 managers in a certain city were asked how many hours they worked...
In a survey, 800 managers in a certain city were asked how many hours they worked in the previous week. Using the results, a 90% confidence interval for the mean number of hours worked was constructed: (38.1, 44.3). Which of the following represents the best interpretation of the result? For those that are not correct, explain the flaw.
(A) We are 90% confident that the mean number of hours worked by managers in this city in the previous week was between 38.1 hours and 44.3 hours.
a. Interpretation doesn't make it clear that 90% is the probability the mean is in the interval
b. This interpretation makes an implication about individuals rather than the mean
c. This interpretation implies that the population mean varies rather than the interval
(B) There is a 90% probability that the mean number of hours worked by managers in this city in the previous week was between 38.1 hours and 44.3 hours
a. This interpretation implies that the mean is only for last week
b. This interpretation implies that the population mean varies rather than the interval
c. This interpretation makes an implication about individuals rather than the mean
(C) 90% of managers in this city worked between 38.1 hours and 44.3 hours last week.
a. Interpretation doesn't make it clear that 90% is the probability the means is in the interval
b. This interpretation makes an implication about individuals rather than the mean
c. This interpretation implies that the mean is only for last week
(D)We are 90% confident that the mean number of hours worked by managers in this country in the previous week was between 38.1 hours and 44.3 hours.
a. This interpretation implies that the population mean varies rather than the interval
b. This interpretation makes an implication about individuals rather than the mean
c. The interpretation should be about mean work hours in a particular city, not the whole country
Homework Answers
A) it is correct
B ) b. This interpretation implies that the population mean varies rather than the interval
c) b. This interpretation makes an implication about individuals rather than the mean
d) c. The interpretation should be about mean work hours in a particular city, not the whole country
Add Answer to:
In a survey, 800 managers in a certain city were asked how many
hours they worked...
In a survey, 500 adults in a certain country were asked how many hours they worked...
In a survey, 500 adults in a certain country were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for mean number of hours worked was lower bound: 37.1 and upper bound: 38.9. Which of the following represents a reasonable interpretation of the result? For those that are not reasonable, explain the flaw. Complete parts (a) through (d) below. (a) There is a 95% chance the mean number of hours worked...
I need help with - (c) 95% of adults in this country worked between 38.7 hours...
I need help with - (c) 95% of adults in this country worked between 38.7 hours and 44.1 hours last week. - at the bottom - Thank you! In a survey, 1200 adults in a certain country were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for mean number of hours worked was lower bound: 38.7 and upper bound: 44.1. Which of the following represents a reasonable interpretation of the...
In a survey conducted by a polling company, 1100 adult Americans were asked how many hours...
In a survey conducted by a polling company, 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for the mean number of hours worked had a lower bound of 42.7 and an upper bound of 44.5. Provide two recommendations for decreasing the margin of error of the interval. Select all that apply. A. Increase the sample size. B. Decrease the standard deviation of hours worked. C. Use...
In a survey conducted by the Gallup Organization, 1100 adult Americans were asked how many hours...
In a survey conducted by the Gallup Organization, 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for the mean number of hours worked had a lower bound of 42.7 and an upper bound of 44.5. Provide two recommendations for decreasing the margin of error of the interval. Select all that apply. A. Decrease the sample size. B. Increase the sample size. O C. Decrease the standard...
A survey of 570 working adults in the United States asked each participant how many hours...
A survey of 570 working adults in the United States asked each participant how many hours they worked last week. The survey showed an average of 41.525 hours worked per week, with a standard deviation of 14.828 hours. (Note that this is the average for people that work in the United States, including part-time employees. Among full time employees, the average work week is closer to 47 hours. Link if you're interested: http://www.gallup.com/poll/175286/hour-workweek-actually-longer-seven-hours.aspx) Is there enough evidence to show that...
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)
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.
A survey asked people, "How many hours do you spend watching reality TV shows per week?"....
A survey asked people, "How many hours do you spend watching reality TV shows per week?". From a random sample of 1200 people, sample mean was 9.5 and the (sample) standard deviation was 3.1 hours. Construct a 90% confidence interval for population mean A (6.4, 12.6) B. Cannot compute based on the given information. C-19.32, 9.68) D.(4.4, 15.6) E. (9.35, 9.65) QUESTION 20 (Continue from the previous question) what is the minimum required sample size to make sure that the...
A class survey in a large class for first-year college students asked, "About how many hours...
A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 451 students was x¯¯¯x¯ = 15 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 9 hours in the population of all first-year students at this university. What is the 99% confidence interval (±±0.001) for the population mean? Confidence interval is from_____ to ____ hours.
A survey asked, “On the average day, about how many hours do you personally watch TV?”...
A survey asked, “On the average day, about how many hours do you personally watch TV?” Below is the data summary: Variable N Mean SE 95% CI TV Hours 892 2.76 0.08 (2.60, 2.93) (1.1) A student who has not taken SOC 210 offers this interpretation of the confidence interval: “There is a 95% chance that average TV hours is between 2.60 and 2.93 hours per day.” What is wrong with this interpretation? State the correct interpretation.
In a survey conducted by a polling company, 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for the mean number of hours worked had a lower bound of 42.7 and an upper bound of 44.5. Provide two recommendations for decreasing the margin of error of the interval. Select all that apply. A. Increase the sample size. B. Decrease the standard deviation of hours worked. C. Use...
In a survey conducted by the Gallup Organization, 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results, a 95% confidence interval for the mean number of hours worked had a lower bound of 42.7 and an upper bound of 44.5. Provide two recommendations for decreasing the margin of error of the interval. Select all that apply. A. Decrease the sample size. B. Increase the sample size. O C. Decrease the standard...
A survey of 570 working adults in the United States asked each participant how many hours they worked last week. The survey showed an average of 41.525 hours worked per week, with a standard deviation of 14.828 hours. (Note that this is the average for people that work in the United States, including part-time employees. Among full time employees, the average work week is closer to 47 hours. Link if you're interested: http://www.gallup.com/poll/175286/hour-workweek-actually-longer-seven-hours.aspx) Is there enough evidence to show that...
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.
A survey asked people, "How many hours do you spend watching reality TV shows per week?". From a random sample of 1200 people, sample mean was 9.5 and the (sample) standard deviation was 3.1 hours. Construct a 90% confidence interval for population mean A (6.4, 12.6) B. Cannot compute based on the given information. C-19.32, 9.68) D.(4.4, 15.6) E. (9.35, 9.65) QUESTION 20 (Continue from the previous question) what is the minimum required sample size to make sure that the...
Most questions answered within 3 hours.
-
MATLAB HW 11 problem using Switch Case and Input commands
Write a script file that calculates...
asked 5 minutes ago -
A college student is employed as a door-to-door newspaper
salesman. Historical data suggests that the student...
asked 20 minutes ago -
Considering gravitational time dilation, calculate the time that
passes in Earth’s surface while 1 hour passes...
asked 44 minutes ago -
Minitab Problem: Take the Lake Hume June rainfall data and find
use the processes outlined in...
asked 1 hour ago -
X Company is trying to decide whether to continue using old
equipment to make Product A...
asked 1 hour ago -
IN PYTHON ONLY !! Program 2: Re-work
program #5 (WeeklyHours) from the previous assignment such that...
asked 2 hours ago -
The average length of time between arrivals at a turnpike
toll-booth is 26 seconds. What is...
asked 3 hours ago -
(a) A piston at 6.1 atm contains a gas that occupies a volume of
3.5 L....
asked 5 hours ago -
Please answer true or false. Words
cannot be changed or added in to make it true...
asked 5 hours ago -
An empty test tube weighs 15.923 grams. Then,
MgCl2•6H2O is added into the test tube. After...
asked 5 hours ago -
Assume memory access is 10 units of time and disk access is
10000 units of time....
asked 5 hours ago -
1. Are all good samples random?
2. Magazines often report surveys giving statistics such as “63%...
asked 5 hours ago