Rules
 Teams of five or less students.
 Choose team name…
 Write up four answer cards: A, B, C and D
 Answer when prompted.
 Winning team’s players earn a small bonus on Exam 3.
Question 1
A two-tailed hypothesis test with α = 3% has what
critical value(s)?
A. -1.88
B. 1.88
C. ± 1.88
D. ± 2.17
Question 1
A two-tailed hypothesis test with α = 3% has what
critical value(s)?
A. -1.88
B. 1.88
C. ± 1.88
D. ± 2.17
Question 2
If a jury convicts an innocent defendant, this is an
example of:
A. A Type α error.
B. A Type β error.
C. A Type 1 error.
D. A Type 2 error.
Question 2
If a jury convicts an innocent defendant, this is an
example of:
A. A Type α error.
B. A Type β error.
C. A Type 1 error.
D. A Type 2 error.
Question 3
For the HT problem on the board, the zstat =
A. 0.92
B. 1.82
C. 2.05
D. 3.40
Question 3
For the HT problem on the board, the zstat =
A. 0.92
B. 1.82
C. 2.05
D. 3.40
Question 4
For the problem on the board, the correct interpretation
of the p-value is:
A. There is only a 3.4% chance that the alternative
hypothesis is true.
B. There is only a 3.4% chance that the null hypothesis
is true.
C. There is only a 3.4% chance that we would get our
data (or worse) assuming the alternative is true.
D. There is only a 3.4% chance that we would get our
data (or worse) assuming the null is true.
Question 4
For the problem on the board, the correct interpretation
of the p-value is:
A. There is only a 3.4% chance that the alternative
hypothesis is true.
B. There is only a 3.4% chance that the null hypothesis
is true.
C. There is only a 3.4% chance that we would get our
data (or worse) assuming the alternative is true.
D. There is only a 3.4% chance that we would get our
data (or worse) assuming the null is true.
Question 5
For the problem on the board, the final answer is:
A. Accept H0, the population mean is about 1000.
B. Accept H0, the sample mean is about 1000.
C. Reject H0, the population mean is greater than 1000.
D. Reject H0, the sample mean is greater than 1000.
Question 5
For the problem on the board, the final answer is:
A. Accept H0, the population mean is about 1000.
B. Accept H0, the sample mean is about 1000.
C. Reject H0, the population mean is greater than
1000.
D. Reject H0, the sample mean is greater than 1000.
Question 6
Which statement is FALSE:
A. A small p-value is evidence against the null.
B. A large p-value supports the null.
C. A critical value close to zero is evidence against the
null.
D. A critical value close to zero supports the null.
Question 6
Which statement is FALSE:
A. A small p-value is evidence against the null.
B. A large p-value supports the null.
C. A critical value close to zero is evidence against
the null.
D. A critical value close to zero supports the null.
Daily Double!
 http://www.youtube.com/watch?v=E5LTzcDevrk
 You can bet up to half your current score.
 Leading team tells bet first…
 If you are wrong, you lose the points.
 8 questions remaining.
Category
T-Pain
Question 7: Daily Double
For a left-tailed t-test (Ha: μ < 100) with n = 15 and α =
5%, the correct tcrit is:
A. 1.761
B. 1.753
C. 2.145
D. None of the above.
Question 7
For a left-tailed t-test (Ha: μ < 100) with n = 15 and α =
5%, the correct tcrit is:
A. 1.761
B. 1.753
C. 2.145
D. None of the above. tcrit = -1.761.
Question 8
Do FLC students spend more than $700 annually on
textbooks? Assume that you survey 50 students and
find that the average book cost is $817 with sd $223. At
α = 5%, is there significant statistical evidence that, on
average, FLC students spend more than $700 annually?
A. >, z, p
B. <, t, μ
C. ≠, z, p
D. >, z, μ
Question 8
Do FLC students spend more than $700 annually on
textbooks? Assume that you survey 50 students and
find that the average book cost is $817 with sd $223. At
α = 5%, is there significant statistical evidence that, on
average, FLC students spend more than $700 annually?
A. >, z, p
B. <, t, μ
C. ≠, z, p
D. >, z, μ
Question 9
A population proportion is claimed to be 75%. Your
sample has n = 60 and x = 49. Is the claim right or
wrong?
What is the sample proportion?
A. 23%
B. 75%
C. 82%
D. 119%
Question 9
A population proportion is claimed to be 75%. Your
sample has n = 60 and x = 49. Is the claim right or
wrong?
What is the sample proportion?
A. 23%
B. 75%
C. 82%
D. 119%
Question 10
A population proportion is claimed to be 75%. Your
sample has n = 60 and x = 49. Is the claim right or
wrong?
Which is true:
A. The p-value absolutely rejects the null
B. The p-value rejects the null, but it’s close.
C. The p-value is plausible.
D. The p-value absolutely confirms the null.
Question 10
A population proportion is claimed to be 75%. Your
sample has n = 60 and x = 47. Is the claim right or
wrong?
Which is true:
A. The p-value absolutely rejects the null
B. The p-value rejects the null, but it’s close.
C. The p-value is plausible.
D. The p-value absolutely confirms the null.
Question 11
On a Yes or No question, 65% of men (out of 40)
answered Yes and 82% of women (out of 50) answered
Yes. Is the percentage of women who answered Yes
significantly higher (α = 5%)?
A. No, accept the null, they’re the same.
B. Yes, accept the null, the proportion is higher.
C. No, reject the null, they’re the same.
D. Yes, reject the null, the proportion is higher.
Question 11
On a Yes or No question, 65% of men (out of 40)
answered Yes and 82% of women (out of 50) answered
Yes. Is the percentage of women who answered Yes
significantly higher (α = 5%)?
A. No, accept the null, they’re the same.
B. Yes, accept the null, the proportion is higher.
C. No, reject the null, they’re the same.
D. Yes, reject the null, the proportion is higher.
Daily Double!
 http://www.youtube.com/watch?v=E5LTzcDevrk
 You can bet your entire current score!
 Leading team tells bet first…
 If you are wrong, you lose the points.
 4 questions remaining.
Category
It’s All Greek to Me
Question 12: Daily Double
H0: μ 1 = μ 2
Ha: μ1 ≠ μ2
α = ???
A. α = 1%
B. α = 2%
C. α = 5%
D. α = 10%
p-value = 17%
zstat = -1.37
zcrit = ± 2.33
Question 12
H0: μ 1 = μ 2
Ha: μ1 ≠ μ2
α = ???
A. α = 1%
B. α = 2%
C. α = 5%
D. α = 10%
p-value = 17%
zstat = -1.37
zcrit = ± 2.33
Question 13
For an ANOVA test, which alternative hypothesis is not
correct:
A. Not all the means are the same.
B. At least one mean is different.
C. All the means are different.
D. The means are not all the same.
Question 13
For an ANOVA test, which alternative hypothesis is not
correct:
A. Not all the means are the same.
B. At least one mean is different.
C. All the means are different.
D. The means are not all the same.
Question 14
H0: μ = 600
Ha: μ > 600
α = 5%
A. p-value = 0%
B. p-value = 0.4%
C. p-value = 4%
D. p-value = 5%
p-value = ???
zstat = 2.65
zcrit = 1.65
Question 14
H0: μ = 600
Ha: μ > 600
α = 5%
A. p-value = 0%
B. p-value = 0.4%
C. p-value = 4%
D. p-value = 5%
p-value = ???
zstat = 2.65
zcrit = 1.65
Question 15
Assume that p-value = 2.3 * 10-8. Which statement is
true?
A. The null hypothesis is absolutely false.
B. The null hypothesis is very, very likely false.
C. The null hypothesis is very, very likely true.
D. The null hypothesis is absolutely true.
Question 15
Assume that p-value = 2.3 * 10-8. Which statement is
true?
A. The null hypothesis is absolutely false.
B. The null hypothesis is very, very likely false.
C. The null hypothesis is very, very likely true.
D. The null hypothesis is absolutely true.