Question

If you are given a confidence interval (CI) represented as "35 plus or minus 5" as a margin of error, what would be the lower and upper limits of the CI?

a) 7 to 175

b) 40 to 45

c) 1.96 and 1.96

d) 30 to 40

Answer 1

The lower and upper limits of the confidence interval are 30 and 40 respectively.

Step-by-step explanation:

The confidence interval is determined by adding and subtracting the margin of error from the point estimate. In this case, the point estimate is 35 and the margin of error is 5.

So, the lower limit of the confidence interval is 35 - 5 = 30 and the upper limit is 35 + 5 = 40.

Therefore, the lower and upper limits of the confidence interval are 30 and 40 respectively.