What information can a confidence interval provide that a p-value ...

[mckennatimberlake]

What information can a confidence interval provide that a p-value alone cannot?
 a. The direction of a difference or relationship, if one is concluded to exist.
  b. The amount of variability in the results.
  c. The actual size of an effect such as relative risk of heart attacks.
  d. All of the above.

Question 2

Suppose a researcher examined a relationship between taking aspirin every day (yes/no) and the incidence of a heart attack (yes/no). The sample data showed that those taking aspirin had a lower chance of incidence of heart attack. A chi-square test on the data collected resulted in a p-value less than 0.0001 . The data were collected in a well-designed randomized experiment. Which of the following conclusions is appropriate?
 a. The probability that there is a relationship between the two variables is more than 99.99.
  b. For this population, taking aspirin reduces the risk of heart attack.
  c. Heart attacks happened much more often for the non-aspirin takers than the aspirin takers.
  d. All of the above conclusions are appropriate.

[k.lashomb]

Answer to Question 1

D

Answer to Question 2

B

[mckennatimberlake]

Excellent

[daiying98]

TYSM