Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

1) A normal population has a mean of 78 and the standard deviation of 6. You select a sample of 50.
find out the probability the sample mean is (Round z values to 2 decimal places andfinal answers to 4 decimal places):

(a) Less than 77.

(b) Between 77 and 79.

(c) Between 79 and 80.

(d) Greater than 80.

2) CRA CDs Inc. wants mean lengths of the "cuts" on a CD to be 150 seconds (2 minutes and 30 seconds). This would allow the disk jockeys to have plenty of time for commercials within each 10-minute segment. Suppose the distribution of the length of the cuts follows  normal distribution with the population standard deviation of 9 seconds. Assume we choose a sample of 24 cuts from various CDs sold by CRA CDs Inc.

(a) What could we say about shape of the distribution of the sample mean?

(b) What is the standard error of the mean? (Round your answer to 2 decimal places.)

(c) What percent of the sample means would be greater than 155 seconds? (Round your answer to 2 decimal places.)

(d) What percent of the sample means would be greater than 142 but less than 155 seconds? (Round your answer to 2 decimal places.)

3) The mean amount purchased by a typical customer at Churchill's Grocery Store is $21.00 with a standard deviation of $7.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 42 customers, answer the following problems.

(a) What is the likelihood the sample mean is at least $22.50? (Round z value to 2 decimal places and final answer to 4 decimal places.)

(b) What is the likelihood the sample mean is greater than $20.00 but less than $22.50? (Round z value to 2 decimal places and final answer to 4 decimal places.)

(c) Within what limits would 99 percent of the sample means occur? (Round your answers to 2 decimal places.)

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M92004

Have any Question? 


Related Questions in Statistics and Probability

Manifest destiny was a powerful force in nineteenth century

"Manifest Destiny was a powerful force in nineteenth century America not only calling for the expansion of the nation physically but also for spreading its ideals to more parts of the world. In what ways was slavery both ...

This exercise generalizes aumanns agreement theorem to a

This exercise generalizes Aumann's Agreement Theorem to a set of players of arbitrary finite size. Given an Aumann model of incomplete information with beliefs (N, Y, (Fi) i ∈N  , s, P) with n players, suppose that for e ...

Starting in 1998 a series of credit card usage studies have

Starting in 1998, a series of credit card usage studies have been performed by Sallie Mae, a major provider of educational loans and savings programs. In a recent pilot study, a random pool of 122 loan applicants attendi ...

Purpose of the studythis current research study is a

Purpose of the Study This current research study is a quantitative study. The aim of this research study is to investigate the levels of self-efficacy and to determine whether there is a relationship in quality of life a ...

Question i am sending this question second time because i

Question: I am sending this question second time because I have suspicion about the solution. I am solving it by converting the given percentages into probabilities, and then calculating Expected Freq.=np. Please follow ...

Mrjassica manager of appliances for midtown department

Mr.jassica, Manager of appliances for midtown department store feels that her inventory levels of stoves have been running higher than necessary. Before revising the inventory policy for stoves she records the number sol ...

Imagine that you want to know whether the sat is biased

Imagine that you want to know whether the SAT is biased against Group X and in favor of Group Y. You administer the SAT to members of the two groups; then, 4 years later, you examine the correlations between SAT scores a ...

What three criteria must be met to establish that one

What three criteria must be met to establish that one variable causes changes in behavior? Which of these criteria are met by quasi-experimental designs? Which of these criteria are not met, and why?

Please read below i need help right away i have posed this

Please read below. I need help right away. I have posed this problem in three different ways an the only consistant answer I get is instructing me to go pay money to another site. PLEASE HELP! Inferential Research and St ...

Statistics paperthe final paper provides you with an

STATISTICS Paper The Final Paper provides you with an opportunity to integrate and reflect on what you have learned during the class. The question to address is: "What have you learned about statistics?" In developing yo ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro