(a) find the sample mean
(b) find the sample standard deviation
(c) Construct a 99% confidence interval for the population mean μ.
Homework Answers
Solution :
Given data is 4450.24,4596.57,4366.61,4455.36,4151.27,3727.14,4283.33,4527.47,4407.49,3946.14,4023.48,4221.28
=> sample mean x-bar = sum of terms/number of terms
= 51156.38/12
= 4263.0317
= 4263.0
=> standard deviation s = 260.1469
=> df = n - 1 = 11
=> For 99% confidence interval, t = 3.106
=> A 99% confidence interval for the population mean μ is
=> x-bar +/- t*s/sqrt(n)
=> 4263.0 +/- 3.106*260.1469/sqrt(12)
=> (4029.7458 , 4496.2542)
Add Answer to:
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