Chapter 7: Q.22 (page 428)
An unknown distribution has a mean 12 and a standard deviation of one. A sample size of is taken.
Let = the object of interest.
What is the mean of ?
Short Answer
The mean of.
Chapter 7: Q.22 (page 428)
An unknown distribution has a mean 12 and a standard deviation of one. A sample size of is taken.
Let = the object of interest.
What is the mean of ?
The mean of.
All the tools & learning materials you need for study success - in one app.
Get started for free46. Draw the graph from Exercise 7.45
According to the Internal Revenue Service, the average length of time for an individual to complete (keep records for, learn, prepare, copy, assemble, and send) IRS Form is hours (without any attached schedules). The distribution is unknown. Let us assume that the standard deviation is two hours. Suppose we randomly sample taxpayers.
a. In words,
b. In words,
c.
d. Would you be surprised if the taxpayers finished their Form s in an average of more than hours? Explain why or why not in complete sentences.
e. Would you be surprised if one taxpayer finished his or her Form in more than hours? In a complete sentence, explain why.
An unknown distribution has a mean of and a standard deviation of . A sample size of is drawn randomly from the population.
Find the sum that is two standard deviations above the mean of the sums.
Find the probability that the sum of the values is greater than.
Salaries for teachers in a particular elementary school district are normally distributed with a mean ofand a standard deviation of . We randomly survey ten teachers from that district.
a. Find thepercentile for an individual teacher’s salary.
b. Find the percentile for the average teacher’s salary.
What do you think about this solution?
We value your feedback to improve our textbook solutions.