Algebra 2
Algebra 2
1st Edition
ISBN: 9780078884825
Author: McGraw-Hill/Glencoe
Publisher: Glencoe/McGraw-Hill School Pub Co
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Chapter MPS, Problem 12.10MPS
To determine

Determine a 95% confidence interval.

Expert Solution & Answer
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Answer to Problem 12.10MPS

  84.4283μ85.5717

Explanation of Solution

Given information:

A sample of 144 students was asked for the average amount of time they spent talking on the phone every day. The mean time was 85 minutes with a standard deviation of 3.5 minutes.

Calculation:

The 95% confidence interval formula is,

  CI=X¯±1.96sn.....(1)

Substitute X¯=85min,s=3.5min&n=144 in equation (1) .

  CI=X¯±1.96sn=85±1.963.5144=85±1.963.512=85±1.96×0.291785±0.5717

The lower bond of the interval is,

  l=850.5717=84.4283

The upper bond of the interval is,

  u=85+0.5717=85.5717

So, the 95% confidence interval estimate is 84.4283μ85.5717 .

Hence, the 95% confidence interval estimate of the sample with X¯=85min,s=3.5min&n=144 is 84.4283μ85.5717 .

Chapter MPS Solutions

Algebra 2

Ch. MPS - Prob. 1.11MPSCh. MPS - Prob. 1.12MPSCh. MPS - Prob. 1.13MPSCh. MPS - Prob. 2.1MPSCh. MPS - Prob. 2.2MPSCh. MPS - Prob. 2.3MPSCh. MPS - Prob. 2.4MPSCh. MPS - Prob. 2.5MPSCh. MPS - Prob. 2.6MPSCh. MPS - Prob. 2.7MPSCh. MPS - Prob. 2.8MPSCh. MPS - Prob. 2.9MPSCh. MPS - Prob. 3.1MPSCh. MPS - Prob. 3.2MPSCh. MPS - Prob. 3.3MPSCh. MPS - Prob. 3.4MPSCh. MPS - Prob. 3.5MPSCh. MPS - Prob. 3.6MPSCh. MPS - Prob. 3.7MPSCh. MPS - Prob. 3.8MPSCh. MPS - Prob. 3.9MPSCh. MPS - Prob. 4.1MPSCh. MPS - Prob. 4.2MPSCh. MPS - Prob. 4.3MPSCh. MPS - Prob. 4.4MPSCh. MPS - Prob. 4.5MPSCh. MPS - Prob. 4.6MPSCh. MPS - Prob. 4.7MPSCh. MPS - Prob. 4.8MPSCh. MPS - Prob. 4.9MPSCh. MPS - Prob. 5.1MPSCh. MPS - Prob. 5.2MPSCh. MPS - Prob. 5.3MPSCh. MPS - Prob. 5.4MPSCh. MPS - Prob. 5.5MPSCh. MPS - Prob. 5.6MPSCh. MPS - Prob. 5.7MPSCh. MPS - Prob. 5.8MPSCh. MPS - Prob. 5.9MPSCh. MPS - Prob. 5.10MPSCh. MPS - Prob. 5.11MPSCh. MPS - Prob. 6.1MPSCh. MPS - Prob. 6.2MPSCh. MPS - Prob. 6.3MPSCh. MPS - Prob. 6.4MPSCh. MPS - Prob. 6.5MPSCh. MPS - Prob. 6.6MPSCh. MPS - Prob. 6.7MPSCh. MPS - Prob. 6.8MPSCh. MPS - Prob. 6.9MPSCh. MPS - Prob. 6.10MPSCh. MPS - Prob. 6.11MPSCh. MPS - Prob. 6.12MPSCh. MPS - Prob. 6.13MPSCh. MPS - Prob. 7.1MPSCh. MPS - Prob. 7.2MPSCh. MPS - Prob. 7.3MPSCh. MPS - Prob. 7.4MPSCh. MPS - Prob. 7.5MPSCh. MPS - Prob. 7.6MPSCh. MPS - Prob. 7.7MPSCh. MPS - Prob. 7.8MPSCh. MPS - Prob. 7.9MPSCh. MPS - Prob. 7.10MPSCh. MPS - Prob. 7.11MPSCh. MPS - Prob. 8.1MPSCh. MPS - Prob. 8.2MPSCh. MPS - Prob. 8.3MPSCh. MPS - Prob. 8.4MPSCh. MPS - Prob. 8.5MPSCh. MPS - Prob. 8.6MPSCh. MPS - Prob. 8.7MPSCh. MPS - Prob. 8.8MPSCh. MPS - Prob. 8.9MPSCh. MPS - Prob. 9.1MPSCh. MPS - Prob. 9.2MPSCh. MPS - Prob. 9.3MPSCh. MPS - Prob. 9.4MPSCh. MPS - Prob. 9.5MPSCh. MPS - Prob. 9.6MPSCh. MPS - Prob. 9.7MPSCh. MPS - Prob. 9.8MPSCh. MPS - Prob. 9.9MPSCh. MPS - Prob. 9.10MPSCh. MPS - Prob. 9.11MPSCh. MPS - Prob. 10.1MPSCh. MPS - Prob. 10.2MPSCh. MPS - Prob. 10.3MPSCh. MPS - Prob. 10.4MPSCh. MPS - Prob. 10.5MPSCh. MPS - Prob. 10.6MPSCh. MPS - Prob. 10.7MPSCh. MPS - Prob. 10.8MPSCh. MPS - Prob. 10.9MPSCh. MPS - Prob. 10.10MPSCh. MPS - Prob. 11.1MPSCh. MPS - Prob. 11.2MPSCh. MPS - Prob. 11.3MPSCh. MPS - Prob. 11.4MPSCh. MPS - Prob. 11.5MPSCh. MPS - Prob. 11.6MPSCh. MPS - Prob. 11.7MPSCh. MPS - Prob. 11.8MPSCh. MPS - Prob. 11.9MPSCh. MPS - Prob. 11.10MPSCh. MPS - Prob. 11.11MPSCh. MPS - Prob. 11.12MPSCh. MPS - Prob. 12.1MPSCh. MPS - Prob. 12.2MPSCh. MPS - Prob. 12.3MPSCh. MPS - Prob. 12.4MPSCh. MPS - Prob. 12.5MPSCh. MPS - Prob. 12.6MPSCh. MPS - Prob. 12.7MPSCh. MPS - Prob. 12.8MPSCh. MPS - Prob. 12.9MPSCh. MPS - Prob. 12.10MPSCh. MPS - Prob. 12.11MPSCh. MPS - Prob. 12.12MPSCh. MPS - Prob. 13.1MPSCh. MPS - Prob. 13.2MPSCh. MPS - Prob. 13.3MPSCh. MPS - Prob. 13.4MPSCh. MPS - Prob. 13.5MPSCh. MPS - Prob. 13.6MPSCh. MPS - Prob. 13.7MPSCh. MPS - Prob. 13.8MPSCh. MPS - Prob. 13.9MPSCh. MPS - Prob. 13.10MPSCh. MPS - Prob. 13.11MPSCh. MPS - Prob. 14.1MPSCh. MPS - Prob. 14.2MPSCh. MPS - Prob. 14.3MPSCh. MPS - Prob. 14.4MPSCh. MPS - Prob. 14.5MPSCh. MPS - Prob. 14.6MPSCh. MPS - Prob. 14.7MPSCh. MPS - Prob. 14.8MPSCh. MPS - Prob. 14.9MPSCh. MPS - Prob. 14.10MPS
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