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

Shoesmith wave inc a new and largely unproven economic

Shoesmith Wave, Inc., a new and largely unproven economic forecasting service, expects the inflation rate in South Korea to average 9 percent per year over the next five years. In comparison, Shoesmith expects a U.S. inf ...

Three different brands of pain relief medication are

Three different brands of pain relief medication are available for minor aches and pains. It is of interest to know whether the mean time to relieve the pain differs from brand to brand. To find out, twelve individuals w ...

Thirteen students were randomly selected from the college

Thirteen students were randomly selected from the College of Public Health and their diastolic blood pressure was tested. The sample mean and standard deviation were 80.9 mmHg and 2.1 mmHg respectively. What is the obtai ...

Hello kitty company claims that the proportion of its

Hello Kitty Company claims that the proportion of its employees investing in individual investment accounts is higher than national proportion of 50%. A survey of 100 employees in Hello Kitty Company indicated that 58 of ...

1 what geographical and historical factors have led

1. What geographical and historical factors have led Singapore to develop such a particular, and highly valued, local form of the English language? 2. Why are the tiny Spratly Islands such a controversial issue in Southe ...

A shoe company checks police records on 1200 randomly

A shoe company checks police records on 1200 randomly selected auto accidents and notes that teenagers were at the wheel in 180 of them. Construct a 90% confidence interval estimate of the proportion of shoe accidents th ...

1 must all experiments include a control group explain2 in

1. Must all experiments include a control group? Explain. 2. In what way do researchers take a risk if they do not pilot test the independent variable they plan to use in an experiment?

One of the most famous labormanagement conflicts took place

One of the most famous labor/management conflicts took place in the 1902 Coal Strike in Pennsylvania. The strike brought the coalmine owner George Baer against the United Mine Workers Union, and led Theodore Roosevelt to ...

1 why must a different t-test be used for matched-subjects

1. Why must a different t-test be used for matched-subjects and within-subjects designs than for randomized groups designs? 2. What was W. S. Gosset's contribution to behavioral research?

Question a survey found that an american family generates

Question: A survey found that an American Family generates an average of 17.2 lb of glass garbage each year. Assume that the standard deviation of the distribution is 2.5 pounds. If a sample of 55 families is randomly se ...

  • 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