In a press release datednbspoctober 2 2008 thenbspnational, Ask an Expert

Statistics

In a press release dated October 2, 2008, The National Cyber Security Alliance reported that approxi- mately 80% of adult Americans who own a computer claim to have a firewall installed on their computer to prevent hackers from stealing personal information. This estimate was based on a survey of 3000 people. It was also reported that in a study of 400 computers, only about 40% actually had a firewall installed.

a. Suppose that the true proportion of computer owners who have a firewall installed is .80. If 20 computer owners are selected at random, what is the probability that more than 15 have a firewall installed?

b. Suppose that the true proportion of computer owners who have a firewall installed is .40. If 20 computer owners are selected at random, what is the probability that more than 15 have a firewall installed?

c. Suppose that a random sample of 20 computer own- ers is selected and that 14 have a firewall installed. Is it more likely that the true proportion of computer owners who have a firewall installed is .40 or .80? Justify your answer based on probability calculations.

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91725916

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

41 of the doctors in america are dentists if a random

41% of the doctors in America are dentists. If a random sample of size 826 is selected, what is the probability that the proportion of doctors who are dentists will be less than 40%?

Assume in a particular year aprojecthas the following

Assume in a particular year aprojecthas the following financials: NOI o $700,000; Annual Bedt Service o $430,000 (of which $400k is intrest and 30k is priciple); original loan debt of 6.2M: 39 yr depreciable life: $8M no ...

Ecolap inc ecl recently paid a 046 dividend the dividend is

Ecolap Inc. (ECL) recently paid a $0.46 dividend. The dividend is expected to grow at a 12.50 percent rate. The current stock price is $49.72. What is the return shareholders are expecting?

If the data are pooled the 48 before scores had an average

If the data are pooled, the 48 "before" scores had an average of 7.48 and a standard deviation of 0.652. Assume that the "before" scores of people who have not seen any pictures has an average of 7.48 and a standard devi ...

Assume a firm has 45 million in operating profit the firms

Assume a firm has $45 million in operating profit. The firm's tax rate is 40%. What is the tax shield of the firm's $38 million in debt that charges a 10% interest rate?

A survey found that 80 of college students had access to a

A survey found that 80% of college students had access to a tablet. A sample of 250 college students is taken. Find the mean and standard deviation for this binomial distribution.

1the r-squared of a linear regression model is equal to the

1)The R-squared of a linear regression model is equal to the proportion of the variance of the target explained by a linear regression model. 2). The R-squared of a linear regression model is equal to the proportion of t ...

You work at patty king home of the cinnamon roll breakfast

You work at Patty King, home of the Cinnamon Roll Breakfast Sandwich, as the manager of the early morning shift. You want to estimate the probability that at least 5 customers enter the store in the next 10 minutes. Woul ...

Given a normally distributed random variable x with mean mu

Given a normally distributed random variable, X, with mean (μ) and standard deviation (σ) shown on the right, calculate P(a μ =15 s = 2 a =16 b =20 Given a normally distributed random variable, X, with mean (μ) and stand ...

Sixty percent of adults have looked at their credit score

Sixty percent of adults have looked at their credit score in the past six months. If you select 31 customers, what is the probability that at least 25 of them have looked at their score in the past six months?

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