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

Suppose that the number of men equals the number of women

Suppose that the number of men equals the number of women, and that Vera is last on the preference list of every man. Prove that under every stable matching, Vera is matched to the same man. Who is the unlucky guy?

Peter has two envelopes he puts 10k euros in one and 10k1

Peter has two envelopes. He puts 10k euros in one and 10 k+1 euros in the other, where k is the outcome of the toss of a fair die. Peter gives one of the envelopes to Mark and one to Luke (neither Mark nor Luke knows the ...

The amount of soda a dispensing machine pours into a 12

The amount of soda a dispensing machine pours into a 12 ounce can of soda follows a normal distribution with a standard deviation of 0.08 ounce. Every can that has more than 12.20 ounces of soda poured into it causes a s ...

The weights of the fish in a certain lake are normally

The weights of the fish in a certain lake are normally distributed with a mean of 13 lb and a standard deviation of 12. If 16 fish are randomly selected, what is the probability that the mean weight will be between 10.6 ...

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 ...

1 can single-case experimental designs be used to test the

1. Can single-case experimental designs be used to test the effects of various levels of an independent variable (as in a one-way group design)? Explain. 2. How many levels of the independent variable are there in an ABA ...

Validity true story i once spoke to a retired professor who

Validity: True story: I once spoke to a retired professor who used to teach general studies geography. His grading technique was to throw the papers/tests on the ground and randomly assign the same grade to each pile (wi ...

1 how did commerce at this stage of societal development

1. How did commerce at this stage of societal development influence the decisions/actions of governments? Some very specific results of these decisions influenced the circumstances we have today. Be sure to include addit ...

A car salesmen claims that a particular make of a car would

A car salesmen claims that a particular make of a car would give a mean mileage of greater than 20mpg. If I ran 10 cars on one gallon of gas each and came up with 10 different results, what statistical formula would I us ...

Consider rolling a fair 6-faced die twice let a be the

Consider rolling a fair 6-faced die twice. Let A be the event that the sum of the two rolls is atmost 6, and B be the event that the first one is an even number. (a) What is the probability that the sum of the two rolls ...

  • 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