electrofy456
21.11.2019 •
Mathematics
Arandom sample of 150 towns in a western state had a mean annual precipitation of 2.86 inches. assume that the population standard deviation is known to be 0.78 inches. compute the 95% confidence interval for μ select one: a. 2.51 to 3.53 inches b. 2.74 to 2.98 inches c. 2.43 to 3.79 inches d. 2.31 to 3.88 inches
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Ответ:
b. 2.74 to 2.98 inches
Step-by-step explanation:
Confidence Interval can be calculated using M±ME where
M is the mean annual precipitation (2.86 inches)ME is the margin of error from the meanAnd margin of error (ME) can be calculated as
ME=
where
z is the corresponding statistic in 95% confidence level (1.96)s is the standard deviation of the population (0.78) N is the number of towns sampled (150)Putting the numbers, we get:
ME=
≈ 0.1248
95% Confidence Interval would be 2.86±0.12 or 2.74 to 2.98 inches
Ответ:
B)Protect shipping routes to Russia
hope it helps:)