(Answered) An article in the national geographic news us racking up

Statistics

An article in the National Geographic News ("U.S. Racking Up Huge Sleep Debt," February 24, 2005) argues that Americans are increasingly skimping on their sleep. A researcher in a small Midwestern town wants to estimate the mean weekday sleep time of its adult residents. He takes a random sample of 80 adult residents and records their weekday mean sleep time as 6.4 hours and standard deviation is fairly stable at 1.8 hours.

a. Calculate the 95% confidence interval for the population mean weekday sleep time of all adult residents of this Midwestern town

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M92277721
Price:- $10

Verified Expert

Priced at $20 Now at $10, Verified Solution

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

Lets see how much you have been paying attention for your

Let's see how much you have been paying attention. For your first Pause-Problem in this chapter, please tell me three things that differentiate parametric from non-parametric tests (Hint: There are actually four, so see ...

Assume that 8 of people have ab blood a hospital blood bank

Assume that 8% of people have AB blood. A hospital blood bank needs ABblood so the blood bank begins checking potential donors. Use this Excel file geometric probabilities (enable the macro after opening the file) or thi ...

A manufacture claims that the life span of its tires is

A manufacture claims that the life span of its tires is 52,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of these tires are normally distributed. You select 1 ...

Rippards has a debt ratio of 15 a total asset turnover

Rippard's has a debt ratio of 15%, a total asset turnover ratio of 3.0 and a return on equity (ROE) of 48%. Compute Rippard's net profit margin.

Letnbspnmnbspv denote the normal random variable with

Let N ( m , v ) denote the normal random variable with mean m and variance v . (a) If X is a Standard Normal variable, what is the distribution of the random variable 4 X - 1? (b) If X ~ N (3,1) and Y ~ ...

A manufacturer obtains clock-radios from three different

A manufacturer obtains? clock-radios from three different? subcontractors: 10?% from? A, 30?% from? B, and 60?% from C. The defective rates for these subcontractors are 3?%, 2 %, and 5?% respectively. If a defective? clo ...

A student must answer 15 truefalse questions for a test but

A student must answer 15 true/false questions for a test, but the student did not study well. If the student randomly guesses on each question , what is the probability that the student answers 3 questions correctly?

In a large university 20 of the students are business

In a large university, 20% of the students are business majors. A random sample of 100 students is selected, and their majors are recorded. 1. Compute the standard error of the proportion. 2. What is the probability that ...

You are working for a large corporation and oversee a

You are working for a large corporation and oversee a marketing research project. For this study, your questionnaire length is 10 minutes and the incidence is 35%, yielding a CPI is $23.00. Your company requires all rese ...

Before-tax cost of debt and after-tax cost of debt david

Before-tax cost of debt and after-tax cost of debt David Abbot is buying a new house, and he is taking out a 30-year mortgage. David will borrow $200,000 from a bank, and to repay the loan he will make 360 monthly paymen ...

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

Recent Questions

Ask Statistics and Probability Expert