Author Question: A small college wants to know what percentage of its current 2,500 students wants a switch to a ... (Read 683 times)

jasdeep_brar

  • Hero Member
  • *****
  • Posts: 569
A small college wants to know what percentage of its current 2,500 students wants a switch to a quarter system. Every student in the college is polled with a question attached to the course registration form. What's the margin of error for the poll?
 a. 5
  b. 2
  c. 0
  d. It depends on the observed sample proportion.

Question 2

An observational study found a statistically significant relationship between regular consumption of tomato products (yes, no) and development of prostate cancer (yes, no), with lower risk for those consuming tomato products. Setting aside the feasibility of doing so, suppose the results had been based on a randomized experiment (instead of an observational study), in which men were randomly assigned to consume or abstain from tomato products. Which of the following problems associated with observational studies would no longer be a problem?
 a. The statistically significant reduced risk of prostate cancer could be caused by confounding variables instead of by consumption of tomato products.
  b. The people who volunteered for the study may not be a representative sample.
  c. The people in the study may lie about what they actually ate.
  d. The participants were not blind to what they were eating.



vickybb89

  • Sr. Member
  • ****
  • Posts: 347
Answer to Question 1

C

Answer to Question 2

A



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Did you know?

The effects of organophosphate poisoning are referred to by using the abbreviations “SLUD” or “SLUDGE,” It stands for: salivation, lacrimation, urination, defecation, GI upset, and emesis.

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

For a complete list of videos, visit our video library