Arithmetic Mean and Correct Answer

 Question 1
1 out of 1 points
Questions 1 through 4 refer to the following:
According to the US Department of Health and Human Services, the percentage of adults who smoked cigarettes in 2011 was 19%. A survey of 500 adults taken in 2012 found 85 who smoke. The researcher is interested in finding evidence at the .05 significance level of a decrease from 2011 to 2012 in the proportion of US adults who smoke.
Which of the following pairs of hypotheses is suggested by the scenario described above?
Selected Answer: E.
H0: p ≥ 0.19 HA: p < 0.19
Correct Answer: B.
H0: p ≥ 0.19 HA: p < 0.19
 Question 2
1 out of 1 points
What is the value of the test statistic? Selected Answer: C.
-1.140
Correct Answer: C.
-1.140
 Question 3
1 out of 1 points
Which of the following correctly characterizes the p-value? Selected Answer: D. p-value > .10
Correct Answer: D. p-value > .10
 Question 4
1 out of 1 points
What is the correct decision? Selected Answer: B.
Do Not Reject H0
Correct Answer: B.
Do Not Reject H0
 Question 5
0 out of 1 points
Questions 5 through 8 refer to the following:
In 1985, the mean weight of players in the National Football League was 225 pounds. A random sample of 50 players taken during the 2012 season showed a mean weight of 249.7 pounds with a sample standard deviation of 35.2 pounds. The researcher is interested in finding evidence at the .05 level that the mean weight of NFL players has increased since 1985.
Which of the following pairs of hypotheses is suggested by the scenario described above?
Selected Answer: D.
H0: μ = 225 HA: μ ≠ 225
Correct Answer: C.
H0: μ ≤ 225 HA: μ > 225

 Question 6
1 out of 1 points
What is the value of the test statistic? Selected Answer: B.
4.962
Correct Answer: B.
4.962
 Question 7
0 out of 1 points
Which of the following is(are) the correct critical value(s)? Selected Answer: D.
-2.010, 2.010
Correct