A sample of 40 people owned an average of 1.35 hats. It is known from a previous study that the population standard deviation of
hat ownership is 0.63 hats. Construct a 95% confidence interval.
1 answer:
Answer:
(1,155, 1.545).
Step-by-step explanation:
From Normal distribution tables the z score for 95% CI = 1.96.
Confidence Interval
= 1.35 +/- 1.96 * 0.63/√40
= 1.35 +/- 0.195
= (1,155, 1.545).
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