For a data set obtained from a sample, n = 100 and x−x- = 44.25. It...
For a data set obtained from a sample, n = 100 and x−x- = 44.25. It is known that σ = 5.5.
(a) What is the point estimate of µ?
b) Find α corresponding to a 95% confidence level.
(c) Find 1 − α/2.
(d) Find to 2 decimal places zα/2 for 95% confidence level.
Homework Answers
Solution :
Given that,
a
Point estimate = sample mean = 
= 44.25
At 95% confidence level the z is ,
b.
= 1 - 95% = 1 - 0.95 = 0.05
c.
/ 2 = 0.05 / 2 = 0.025
d
Z/2
= Z0.025 = 1.96 ( Using z table )
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For a data set obtained from a sample, n = 100 and x−x-
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