Question: Is the given probability distribution valid? (x = 1–5, ΣP(x)=0.868)

Answer Choices:
A. Yes
B. No

Answer: B

Question: It appears that weights of U.S. Army males increased from 1983 to 2015.

Answer Choices:
A–C

Answer: C

Question: Is the given probability distribution valid? (second table, ΣP(x)=1)

Answer Choices:
A. No
B. Yes

Answer: B

Question: Does the first table show a probability distribution?

Answer Choices:
A. Yes
B. Values not associated
C. Probabilities not between 0 and 1
D. Sum not equal to 1
E. Categorical variable

Answer: A. Yes, the table shows a probability distribution.

Question: Find the mean of x.

Answer Choices:
A. μ = ___ students
B. Not a distribution

Answer: A. μ = 1.6 students

Question: Find the standard deviation of x.

Answer Choices:
A. σ = ___ students
B. Not a distribution

Answer: A. σ = 0.9 students

Question: What do the results tell us (jersey numbers)?

Answer Choices:
A. Jersey numbers on a football team vary much more than expected.
B. The sample standard deviation is too large in comparison to the range.
C. Jersey numbers on a football team do not vary as much as expected.
D. Jersey numbers are nominal data that are just replacements for names, so the resulting statistics are meaningless.

Answer: D

Question: State what the value of f(70) means.

Answer Choices:
A. The projected population is ___ million in the year 2170.
B. The projected population is ___ million in the year 2070.

Answer: B. The projected population is 475.9 million in the year 2070.

Question: Compare the variation between systolic and diastolic measurements.

Answer Choices:
significantly less than / significantly more than / about the same as

Answer: about the same as

Question: How does this compare with the value for 2080 in the table?

Answer Choices:
A. This value is fairly close to the table value.
B. This value is not very close to the table value.

Answer: A. This value is fairly close to the table value.

Question: State what the value of f(70) means.

Answer Choices:
A. The projected population is ___ million in the year 2170.
B. The projected population is ___ million in the year 2070.

Answer: B. The projected population is 474.8 million in the year 2070.

Question: Which of the following best describes the relationship between the computed mean and the actual mean?

Answer Choices:
A. The computed mean is not close to the actual mean because the difference between the means is less than 5% of the actual mean.
B. The computed mean is close to the actual mean because the difference between the means is more than 5% of the actual mean.
C. The computed mean is close to the actual mean because the difference between the means is less than 5% of the actual mean.
D. The computed mean is not close to the actual mean because the difference between the means is more than 5% of the actual mean.

Answer: D

Question: True or False (probability statement).

Answer Choices:
True / False

Answer: True