Chapter 1. BPS_Tutorial_Ch14_Confidence_Intervals_Basics_Part1

1.1 Problem Statement

{550, 575, 600, 625, 650, 675, 700, 725, 750, 775, 800}
rand(0,10)
@sample[$sampleindex]
{23.0, 23.1, 23.2, 23.3, 23.4, 23.5, 23.6, 23.7, 23.8, 23.9, 24.0, 24.1, 24.2, 24.3, 24.4, 24.5, 24.6, 24.7, 24.8, 24.9, 25.0, 25.1, 25.2, 25.3, 25.4, 25.5, 25.6, 25.7, 25.8, 25.9, 26.0, 26.1, 26.2, 26.3, 26.4, 26.5, 26.6, 26.7, 26.8, 26.9. 27.0, 27.1, 27.2, 27.3, 27.4, 27.5, 27.6, 27.7, 27.8, 27.9 28.0}
rand(0,39)
@bmi[$bmiindex]
{6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8,0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0}
rand(0,25)
@stddev[$stddevindex]
$stddev/sqrt($sample)
2*$sdsm
$bmi-$marginoferror
$bmi+$marginoferror

The Body Mass Index (BMI) is used a screening tool for possible weight problems. Adults with a BMI less than 18.5 are considered underweight and those with a BMI greater than 25 may be overweight. A study selected a sample of $sample women aged 20-29 years from the US population of 20 million women in this age group. The mean BMI for these women was = $bmi. The standard deviation is known to be = $stddev.

1.2 Step 1

questions

Question 1.1

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Correct.
Incorrect.

Question 1.2

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Correct.
Incorrect.

Question 1.3

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Correct.
Incorrect.

Question 1.4

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Correct.
Incorrect.

1.3 Step 2

questions

Question 1.5

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Correct.
Incorrect.

Question 1.6

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Correct.
Incorrect.

Question 1.7

The 68-95-99.7 rule for Normal distributions says that about 95% of the probability is within viONEQg/IQeWTS2b standard deviations of the mean.

Correct.
Incorrect.

Question 1.8

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Correct.
Incorrect.

Question 1.9

The 95% confidence interval for the mean BMI of women aged 20-29 years of age is from j1zwxAesmoE= to Sdfro4d5nlo=

Correct.
Incorrect.

Question 1.10

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Correct.
Incorrect.