Author Question: In 2000, the average charge of tax preparation was 95 . Assuming a normal distribution and a ... (Read 95 times)

yoooooman · **on:** Jun 24, 2018

In 2000, the average charge of tax preparation was 95 . Assuming a normal distribution and a standard deviation of 10, use the approximate areas beneath the normal curve, as discussed in this section, to answer : What proportion of tax preparation fees were exactly 100?

Question 2

An unbiased estimator is:
a. any sample statistic used to approximate a population parameter.
b. a sample statistic, which has an expected value equal to the value of the population parameter.
c. a sample statistic, which is usually less than the population parameter.
d. represented by a sample mean, the sample proportion, the sample variance, and the sample standard deviation.
e. any standard error of the mean or standard error of the proportion.