A random sample of n = 64 observations has a mean x = 29.9 and a standard deviation s = 3.7.
1 answer:
Answer:
(29.128,30.672)
Step-by-step explanation:
Given that a random sample of n = 64 observations has a mean x = 29.9 and a standard deviation s = 3.7.
a) the point estimate of the population mean μ.
= Sample mean = 29.9
For 90% we use t critical value since population standard deviation is not known.
T critical for 90% is 1.669
Margin of error = ±
b) Confidence interval 90%
= Mean±Marginof error
=
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Answer:
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Step-by-step explanation:
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