Question

Some of the methods in this section are approximations rather than exact probability results. We have given rules of thumb for safe use of these approximations. (a) You are interested in attitudes toward drinking among the 75 members of a fraternity. You choose 30 members at random to interview. One question is "Have you had five or more drinks at one time during the last week?" Suppose that in fact 30% of the 75 members would say "Yes." Explain why you cannot safely use the B(30, 0.3) distribution for the count X in your sample who say "Yes." The population (the 75 members of the fraternity) is only 2.5 times the size of the sample. Our rule of thumb says that this ratio should be at least _______________.

(b) The National AIDS Behavioral Surveys found that 0.2% (that's 0.002 as a decimal fraction) of adult heterosexuals had both received a blood transfusion and had a sexual partner from a group at high risk of AIDS. Suppose that this national proportion holds for your region. Explain why you cannot safely use the Normal approximation for the sample proportion who fall in this group when you interview an SRS of 1000 adults. Our rule of thumb for the Normal approximation calls for np and n(1 − p) to be at least __________; we have np = (1000)(0.002) = 2.

Answer #1

(A) In this case, sample size is 30 which is more 10% of population size because

(30/75)*100 = 40%

So, we know that the maximum sample size allowed is equal to 10% of the population size, but not more than 10%

**Therefore, Our rule of thumb says that this ratio
should be at least 10 times of the size of the
sample**

**(B) Rule of thumb for normal approximation is that
np and n(1-p), both must be at least 10 or more**

In this case, np = 1000*0.002 = 2. So, this is not valid to assume normal approximation...

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...

Discuss ethical issues that can be identified in this
case and the mode of managing ethics Enron finds itself in this
case. How would you describe the ethical culture and levels of
trust at Enron? Provide reasons for your assessment.
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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 1 minute ago

asked 2 minutes ago

asked 5 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 14 minutes ago

asked 15 minutes ago

asked 15 minutes ago

asked 17 minutes ago

asked 18 minutes ago

asked 28 minutes ago