statistics

A survey of 100 commuters finds the average commuting to work is 25.5 minutes with the standard deviation of 11.5 minutes. construct a 98% confidence interval for the mean commuting time of commuters
E=1.28.11.5 divide by 10= 1.47
(25.5-1.47, 25.5+ 1.47)= (24.3, 26.97)

1. 👍 0
2. 👎 0
3. 👁 53
1. (1- .98)/2 = .01 = 2.33

1. 👍 0
2. 👎 0
posted by Kuai

Similar Questions

1. statystics

: Human Resources took a survey and found that the average commute time one way is 25.4 minutes. However one of the executives feels that the commute is less. He randomly selects 25 commuters and finds that the average is 22.1

2. Statistics

A state survey investigates whether the proportion of 8% for employees who commute by car to work is higher than it was five years ago. A test on employee commuting by car was done on a random sample size of 1000 and found 100

asked by Katelyn on November 11, 2013
3. statistics

the scheduled commuting time on Long Island Rail Road from Glen Cove to New York is 65 minutes. Suppose that the actual commuting time is uniformly distributed between 64 and 74 minutes. What is the probability that the commuting

asked by ann on January 11, 2011
4. statistics

Please advise-Thank you. The Center for Urban Transportation research released a report stating that the average commuting distance in the United States is 10.9 miles Suppose that this average is actually the mean of a sample of

asked by vera on April 21, 2012
5. statistics

average commuting distance 10.9 miles which is also the mean of a sample of 300 commuters. Sample sd is 6.2 miles . Estimate the true mean using 99% confidence please.

asked by peter on November 13, 2013
6. math

Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.

asked by brewser on July 12, 2014
7. stats

Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.

asked by brewster on July 10, 2014
8. Statistics and Probability

Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.

asked by Alley on December 3, 2012
9. statistics

According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79

asked by ali awan on May 8, 2013
10. statistics

According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79

asked by ali awan on May 7, 2013

More Similar Questions