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