For children in the high income group, find a 98% confidence interval for the mean nickel diameter.
a) Critical value (positive value only):
b) Margin of error:
c) Confidence interval: < <
d) Does the confidence interval support the claim that average nickel size drawn by children from the high income is less than 22 mm?
a) Critical value (positive value only):
b) Margin of error:
c) Confidence interval: < <
d) Does the confidence interval support the claim that average nickel size drawn by children from the high income is less than 22 mm?