Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

Confidence interval for the population mean.

Consider college officials in admissions, registration, counselling, financial aid, campus ministry, food services, and so on. How much money do these people make each year? Suppose you read in your local paper that 45 officials in student services earned an average of x = $50,340 each year.

(a) Assume that σ = $16,920 for salaries of college officials in student services. Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error.

(b) Suppose that σ = $10,780 for salaries of college officials in student services. Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error?

(c) Presume that σ = $44830 for salaries of college officials in student services. Find a 90% confidence interval for the population means salary of such personnel. What is the margin of error?

(d) Evaluate the margins of errors for parts (a) through (c). As the standard deviation decreases, does the margin of error decrease?

(e) Evaluate the lengths of the confidence intervals for parts (a) through (c). As the standard deviation decreases, does the length of a 90% confidence interval decrease?

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M920159

Have any Question? 


Related Questions in Statistics and Probability

A random sample of the price of gasoline from 20gas

A random sample of the price of gasoline from 20gas stations in a region gives the statistics below. Complete parts a) and b) ybar = $3.59, s = $0.24 a) Find a 95% confidence interval for the mean price of regular gasoli ...

Hypothesesh0 there is no correlation between hours walking

Hypotheses H0 There is no correlation between hours walking and weight loss. H1 There is a positive correlation between hours walking and weight. H2 There is a negative correlation between hours walking and weight loss. ...

Consider a sealed-bid first-price auction with two buyers

Consider a sealed-bid first-price auction with two buyers whose private values are independent; the private value of buyer 1 has uniform distribution over the interval [0, 3], and the private value of buyer 2 has uniform ...

1 discuss how the interrupted time series design with a

1. Discuss how the interrupted time series design with a reversal and the interrupted time series design with multiple replications improve on the simple interrupted time series design. 2. Distinguish between a longitudi ...

Suppose that a ge 3 and let f be a social welfare function

Suppose that |A| ≥ 3, and let F be a social welfare function satisfying the properties of unanimity and independence of irrelevant alternatives. What are all the decisive coalitions?

A population of lawnmowers life expectancy is described

A population of lawnmowers' life expectancy is described with a Weibull distribution, where α=1 and β=15. Determine 1× (once) and 2× (twice) the expected mean lifes for the population, as well as their corresponding cumu ...

A recent study that examined bone strength collected data

A recent study that examined bone strength collected data from cadaveric femurs from subjects in three age groups. The data are below. Does mean bone strength differ for the three age groups? Use a 5% level of significan ...

The middlecreek branch of the national bank of virginia has

The Middlecreek Branch of the national bank of Virginia has 8 real estate loans over $1,000,000. Of these 8 loans, 3 are "underwrite." A loan is underwater if the amount of the loan is greater than the value of the prope ...

In onenbsptownnbsp24nbspof all voters are democrats if two

In one town, 24% of all voters are Democrats. If two voters are randomly selected for a survey, find the probability that they are both Democrats. Round to the nearest thousandth if necessary.

The mean sat score in mathematics is 515 the founders of a

The mean SAT score in mathematics is 515 . The founders of a nationwide SAT preparation course claim that graduates of the course score higher, on average, than the national mean. Suppose that the founders of the course ...

  • 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