Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

Describe 90% confidence interval for the true proportion.

1. As a help to the establishment of personnel requirements the director of a hospital wishes to estimate the mean number of people who are admitted to the emergency room during a 24-hour period. The director arbitrarily selects 64 different 24-hour periods as well as determines the number of admissions for each. For this sample = 19.8 and s2 = 25. Using the sample standard deviation as an approximate for the population standard deviation what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99% reliability?

2. A university dean is attentive in determining the proportion of students who receive some sort of financial help. Rather than study the records for all students the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. Use a 90% confidence interval to approximate the true proportion of students who receive financial aid.

3. An economist is attentive in studying the incomes of consumers in a particular region. The population standard deviation is known to be $1000. A random sample of 50 individuals caused in an average income of $15,000. describe what total sample size would the economist want to use for a 95% confidence interval if the width of the interval must not be more than $100?

a)  n = 1537

b)  n = 385

c)  n = 40

d)  n = 20

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M923374

Have any Question? 


Related Questions in Statistics and Probability

What was manifest destiny what forces created this concept

What was Manifest Destiny? What forces created this concept? How was it to be achieved, and what doubts were raised as to its desirability?

1 in what ways are experimental research designs preferable

1. In what ways are experimental research designs preferable to correlational or descriptive designs? What are the limitations of experimental designs? 2. What is the purpose of random assignment to conditions? 3. Descri ...

The course text notes that tensions and differences in the

The course text notes that tensions and differences in the 1770s led to the American Revolution that eventually produced independence for the United States from Great Britain. When the War for American Independence broke ...

1 all successful empires share certain characteristics what

1. All successful empires share certain characteristics. What are these characteristics and how do they relate to the rise of the Muslim empires? Put Islam in its historical context and explain how the Umayyad and Abbasi ...

Two pollsters are conducting surveys to estimate the

Two pollsters are conducting surveys to estimate the proportion of Clarkston, Michigan citizens who support a bond issue to build a sports stadium. Both pollsters use the same methods; however, their sample sizes differ. ...

1 why are psychologists sometimes interested in

1. Why are psychologists sometimes interested in epidemiology? 2. Why do researchers use probability rather than nonprobability samples when doing descriptive research?

A teacher wants to estimate the average pa of all teachers

A teacher wants to estimate the average pa of all teachers in a district. She wants to be 95% sure her estimate is correct. The standard deviation is $1,000, how large must her sample be to be accurate within $200? Pleas ...

An airplane manufacturer currently produces six models of

An airplane manufacturer currently produces six models of airplanes for commercial sale. the airline that lauren works for is rapidly expanding and would like to purchase three airplanes of different models to service va ...

1 explain how you would use a manipulation check to

1. Explain how you would use a manipulation check to determine whether you successfully manipulated room temperature in a study of temperature and aggression. 2. Distinguish between an independent variable and a subject ...

Explain how you would conduct the study in given question

Explain how you would conduct the study in given question as a within-subjects design. Question:- Imagine that you were conducting an experiment to examine the effect of generous role models on children's willingness to ...

  • 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

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

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen