The formula for estimation is:
Z Score Calculations
The value of z is -7.90569. The value of p is
In a study of the accuracy of fast food drive-through orders, Restaurant A had 298 accurate orders and 51 that were not accurate. a. Construct a 90% confidence interval estimate of the percentage of orders that are not accurate. b. Compare the results from part (a) to this 90% confidence interval for the percentage of orders that are not accurate at Restaurant B:
The average zinc concentration recovered from a sample of measurements taken in 36 different locations in a river is found to be 2.6 grams per liter. Find the 95% confidence intervals for the mean zinc concentration in the river. Assume that the population standard deviation is 0.3 gram per liter.
Given an sample of data set X which is normal-distributed to , I want to find the confidence interval of . As the cut the normal-distribution curve at the point of 200, the sample of is not more normal distributed. Therefore what is a reasonable confidence interval?