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(a) 400 labourers were selected at random from a certain district. Their mean income was 140-5 dollar per month, with standard deviation 25-2 dollar. Set up 95% confidence limits within which the income of the labour community of district is expected to lie. (b) Set up 95% confidence limits for the standard deviation of the entire labour community of the district.

(a) 400 labourers were selected at random from a certain district. Their mean income was 140-5 dollar per month, with standard deviation 25-2 dollar. Set up 95% confidence limits within which the income of the labour community of district is expected to lie. (b) Set up 95% confidence limits for the standard deviation of the entire labour community of the district.

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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(a) 400 labourers were selected at random from a certain district. Their mean income was 140-5 dollar per month, with standard deviation 25-2 dollar. Set up 95% confidence limits within which the income of the labour community of district is expected to lie. (b) Set up 95% confidence limits for the standard deviation of the entire labour community of the district.
Transcribed Image Text:(a) 400 labourers were selected at random from a certain district. Their mean income was 140-5 dollar per month, with standard deviation 25-2 dollar. Set up 95% confidence limits within which the income of the labour community of district is expected to lie. (b) Set up 95% confidence limits for the standard deviation of the entire labour community of the district.
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