A 90% confidence interval for the average weight (in pounds) of Americans was found to be (185, 210). The point estimate for thi
s confidence interval is:_______
a. 25
b. 12.5
c. 197.5
d. 1.645
1 answer:
Answer:
B. 12.5
Step-by-step explanation:
We have the lowe confidence interval = 185
The upper confidence interval = 210
Mean of X = (lower confidence + upper confidence interval)/2
Mean of X = 185 + 210/2
= 197.5
The margin of error = the upper confidence interval - mean of X
= 210-197.5
= 12.5
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