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Question 15 of 15 Step 4 of 4 02:02:20 The following measurements (in picocuries per liter) were recorded by a set of hydroge

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Answer #1

Solution:

Sample mean = (689.1+699.2+707.8+729.8)/4 = 2825.9/ 4 = 706.475

Sample standard deviation = sqrt((689.1-706.475)^2+(699.2-706.475)^2+(707.8-706.475)^2+(729.8-706.475)^2)/3) = 17.33

99% confidence interval can be calculated as

Mean +/- talpha/2*sd/sqrt(n)

706.475 +/- 5.84*17.33/sqrt(4)

706.475 +/- 50.60

655.87 to 757.07

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