The standard deviation for the low-income group is: 3.183

Question

The standard deviation for the high-income group is 3.101

The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table:

Too Small Too Large Total
Low Income 14 26 40
High Income 26 9 35
Total 40 35 75
find a 90% confidence interval for the proportion of children in the low-income group that drew the nickel too large.

Round all answers to 3 decimal places.
(a) Critical value (positive value only):

(b) Margin of error:

(c) Confidence interval:
_____< p <_____

Use the sample data from the previous problems to find a 98% confidence interval for the mean nickel diameter drawn by the children in the high-income group.

(e) Critical value (positive value only):

(f) Margin of error:

(g) Confidence interval:
_____< μ < ______