QNT 2020 MIDTERM REVIEW QUESTIONS WITH
VERIFIED ANSWERS
True or False- A frequency distribution usually has equal bin widths. - Answers - True
True or False-
Scatter plots are used to visualize association in samples of paired data (X, Y). -
Answers - True
True or False- A scatter plot requires two quantitative variables (i.e., not categorical
data). - Answers - true
True or False- Chebyshev's Theorem says that at most 50 percent of the data lie within
2 standard deviations of the mean. - Answers - false
The coefficient of variation is
a. a measure of correlation for two variables.
b. measured on a scale from 0 to 100.
c. a unit-free statistic.
d. helpful when the sample means are zero. - Answers - c. a unit-free statistic.
True or False- Outliers are data values that fall beyond ±2 standard deviations from the
mean. - Answers - False
True or False- The Empirical Rule can be applied to any distribution, unlike
Chebyshev's theorem. - Answers - False
True or False-
Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard
deviations of the mean. - Answers - False
True or False-
In a left-skewed distribution, we expect that the median will be greater than the mean. -
Answers - True
f the mean and median of a population are the same, then its distribution is
a. normal.
b. skewed.
c. uniform.
d. symmetric. - Answers - d. symmetric.
If the random variable Z has a standard normal distribution, then P(1.17 ≤ Z ≤ 2.26) is
VERIFIED ANSWERS
True or False- A frequency distribution usually has equal bin widths. - Answers - True
True or False-
Scatter plots are used to visualize association in samples of paired data (X, Y). -
Answers - True
True or False- A scatter plot requires two quantitative variables (i.e., not categorical
data). - Answers - true
True or False- Chebyshev's Theorem says that at most 50 percent of the data lie within
2 standard deviations of the mean. - Answers - false
The coefficient of variation is
a. a measure of correlation for two variables.
b. measured on a scale from 0 to 100.
c. a unit-free statistic.
d. helpful when the sample means are zero. - Answers - c. a unit-free statistic.
True or False- Outliers are data values that fall beyond ±2 standard deviations from the
mean. - Answers - False
True or False- The Empirical Rule can be applied to any distribution, unlike
Chebyshev's theorem. - Answers - False
True or False-
Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard
deviations of the mean. - Answers - False
True or False-
In a left-skewed distribution, we expect that the median will be greater than the mean. -
Answers - True
f the mean and median of a population are the same, then its distribution is
a. normal.
b. skewed.
c. uniform.
d. symmetric. - Answers - d. symmetric.
If the random variable Z has a standard normal distribution, then P(1.17 ≤ Z ≤ 2.26) is
