Question

Question 2: Confidence Intervals Suppose you are a fourth-grade teacher. Your students have all gone trick-or-treating...

Question 2: Confidence Intervals Suppose you are a fourth-grade teacher. Your students have all gone trick-or-treating for Halloween. You had them keep track of how many pieces of candy they collected in the first hour of trick-or-treating. You know that the amount of candy that a student receives is Normally distributed. On average, the 100 students in the fourth grade had 48 pieces of candy.

a. Assume that you know σ2 = 81 pieces of candy squared, construct a 90 percent confidence interval for the population mean.

b. Now assume you don’t know σ2 but you know s2 = 81 pieces of candy squared. Find the new 90 percent confidence interval.

c. Did you need to use the Central Limit Theorem in part (b)? Explain.

d. Suppose that we did not know that the distribution of candy was Normally distributed. Does it matter for our ability to use the formulas in parts (a) and (b) in this case? In general? Explain clearly.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Suppose you are a fourth grade teacher. Your students have all gone trick-or-treating for Halloween. You...
Suppose you are a fourth grade teacher. Your students have all gone trick-or-treating for Halloween. You had them keep track of how many pieces of candy they collected in the first hour of trick-or-treating. You know that the amount of candy that a student receives is Normally distributed. On average, the 100 students in fourth grade had 48 pieces of candy. a. Assume that you know σ2 = 81 pieces of candy squared, construct a 90 percent confidence interval for...
Suppose you are a fourth grade teacher. Your students have all gone trick-or-treating for Halloween. You...
Suppose you are a fourth grade teacher. Your students have all gone trick-or-treating for Halloween. You had them keep track of how many pieces of candy they collected in the first hour of trick-or-treating. You know that the amount of candy that a student receives is Normally distributed. On average, the 100 students in fourth grade had 48 pieces of candy. a. Assume that you know σ^2 = 81 pieces of candy squared, construct a 90 percent confidence interval for...
Suppose you know that the IQ scores of all incoming college freshman are normally distributed with...
Suppose you know that the IQ scores of all incoming college freshman are normally distributed with standard deviation of 15. You have a simple random sample of 100 freshmen, and the mean IQ score for this sample is 120. Find a 90-percent confidence interval for the mean IQ score for the entire population of incoming college freshmen
Question 1 Suppose you needed to form a 92% confidence interval for a population mean. What...
Question 1 Suppose you needed to form a 92% confidence interval for a population mean. What z value would you use? A. 1.41 B. .82 C. 1.96 D. 1.75 Question 2 Which of the following is a way to INCREASE the width of a confidence interval? A. increase the chance for error B. increase the confidence level C. decrease the error D. increase the sample size Question 3 In a random sample of 60 computers, the mean repair cost was...
What role could the governance of ethics have played if it had been in existence in...
What role could the governance of ethics have played if it had been in existence in the organization? Assess the leadership of Enron from an ethical perspective. THE FALL OF ENRON: A STAKEHOLDER FAILURE Once upon a time, there was a gleaming headquarters office tower in Houston, with a giant tilted "£"' in front, slowly revolving in the Texas sun. The Enron Corporation, which once ranked among the top Fortune 500 companies, collapsed in 2001 under a mountain of debt...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT