In order to estimate the average electric usage per month, a sample of 36 houses was selected and the electric usage was determined. Assume a population standard deviation of 335 kilowatt-hours. The margin of error is 109.43. If the sample mean is 1,828 kWh, find the 95% confidence interval estimate of the population mean. 1,718.6 to 1,937.41,493 to 2,163    1,736.2 to 1,919.81,798 to 1,858

In one of the Stat 2 sections, the students in the section have an average height of 64 inches, with a standard deviation of 3 inches. The GSI happens to be 68 inches. Express the height of the GSI in standard units, relative to the students in the section. Choose the answer below that is closest. Group of answer choices 1.67 3.0 1.5 1.33 4.0      PreviousNext

A ski gondola carries skiers to the top of a mountain. Assume that weights of skiers are normally distributed with a mean of 197 lb and a standard deviation of 43 lb. The gondola has a stated capacity of 25 passengers, and the gondola is rated for a load limit of 3750 Ib. Complete parts (a) through (d) below. a. Given that the gondola is rated for a load limit of 3750 lb, what is the maximum mean weight of the passengers if the gondola is filled to the stated capacity of 25 passengers? The maximum mean weight is Ib. (Type an integer or a decimal. Do not round.) b. If the gondola is filled with 25 randomly selected skiers, what is the probability that their mean weight exceeds the value from part (a)? The probability is (Round to four decimal places as needed.) c. If the weight assumptions were revised so that the new capacity became 20 passengers and the gondola is filled with 20 randomly selected skiers, what is the probability that their mean weight exceeds 187.5 lb, which is the…

Most people think that the​ "normal" adult body temperature is 98.6°F. In a more recent​ study, researchers reported that a more accurate figure may be 98.1°F. ​Furthermore, the standard deviation appeared to be around 0.7°F. Assume that a Normal model is appropriate.   b) What fraction of people would be expected to have body temperatures above 98.6°​F?

Assume that a sample is used to estimate a population proportion μμ. Find the margin of error M.E.that corresponds to a sample of size 84 with a mean of 79.2 and a standard deviation of 6.1 at a confidence level of 99.9%.Report ME accurate to one decimal place because the sample statistics are presented with this accuracy.

Assume that a sample is used to estimate a population mean μ. Find the margin of error M.E. that corresponds to a sample of size 22 with a mean of 62.5 and a standard deviation of 9.6 at a confidence level of 80%.Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. =

You would like to make an interval estimate of a population mean from a sample of size 25. Assume the population standard deviation is 6. Assuming 98% Confidence, what is the margin for error for the estimate.

An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 3.4 mm, how many of these components should she consider to be 99% sure of knowing the mean will be within ±0.5±0.5 mm?