2. The travel time to their workplace of a random sample of workers from the central zone of the country is observed in the following frequency table: Minutes 15-27 27 39 51 63 39 51 63 75 Frequency 5 15 20 15 10 It is assumed that the travel times approximate a normal distribution. Calculate: a) A 90% confidence interval for the population average of travel times. b) A 90% confidence interval for the population standard deviation.
2. The travel time to their workplace of a random sample of workers from the central zone of the country is observed in the following frequency table: Minutes 15-27 27 39 51 63 39 51 63 75 Frequency 5 15 20 15 10 It is assumed that the travel times approximate a normal distribution. Calculate: a) A 90% confidence interval for the population average of travel times. b) A 90% confidence interval for the population standard deviation.
A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Question
![2. The travel time to their workplace of a random sample of workers from the
central zone of the country is observed in the following frequency table:
Minutes
15 - 27
27
39
39
51
51
63
63 75
Frequency
5
15
20
15
10
It is assumed that the travel times approximate a normal distribution.
Calculate:
a) A 90% confidence interval for the population average of travel times.
b) A 90% confidence interval for the population standard deviation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9ae7608b-e3b0-4a18-a800-cba093de4388%2Febb30eb9-d21d-4828-9f44-81c6353d6475%2Fkjakcm8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2. The travel time to their workplace of a random sample of workers from the
central zone of the country is observed in the following frequency table:
Minutes
15 - 27
27
39
39
51
51
63
63 75
Frequency
5
15
20
15
10
It is assumed that the travel times approximate a normal distribution.
Calculate:
a) A 90% confidence interval for the population average of travel times.
b) A 90% confidence interval for the population standard deviation.
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VIEWStep 2: Compute the mean and standard deviation for the given frequency table.
VIEWStep 3: Compute the 90% confidence interval for the population average of travel times.
VIEWStep 4: Compute the 90% confidence interval for the population standard deviation.
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