C207 Exam Questions and Answers
100% Pass
1. Which of the following statistics are unaffected by a single large outlier? (More
than one) * - ANSWER-Median, mode, Interquartile range (IQR)
2. Which of the following is most suitable for policy making based on income
distribution? * - ANSWER-Median
Because of assumed skewed distribution
3. If we study data from a population whose mean is 200 and standard deviation is
30, which of the following data points has a z-score of -3? * - ANSWER-110.
4. Which of the following statistics measures the spread of the dataset away from
mean? * - ANSWER-Variance
5. Which of the following are measures of spread or variability of a dataset? (More
than one) * - ANSWER-Variance, range, IQR
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,6. An experiment consists of rolling a die and flipping a coin. Which two choices
below best apply for computing the probability of rolling a 6 on a die AND
flipping head on a coin? * - ANSWER-Multipication and Intersection
AND,BOTH, ALL: Multipication Probability A*Probably B
Mult goes with intersection
7. An experiment consists of rolling a die and flipping a coin. Which two choices
below best apply for computing the probability of rolling a 6 on a die OR flipping
head on a coin? * - ANSWER-Addition and Union
Probably A + Probably B
OR,EITHER: Addition, addition goes with union
The probability that a baby is a girl, given that the baby is wearing pink is 0.8. The
probability that a baby is a girl is 0.5. Which of the choices below best applies for
determining the probability that a baby is wearing pink GIVEN THAT the baby is
a girl? - ANSWER-Bayes Theorem
Probably A/(Probably A + B)
GIVEN THAT
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, 11. We examine a population with normal distribution having a mean = 1,000 and
standard deviation = 50. What approximate percentage of the population lies
between 850 and 1150? * - ANSWER-99.7 because it is -3 and 3 for z score
12. We examine a population with normal distribution having a mean = 1,000 and
standard deviation = 50. What approximate percentage of the population lies
between 900 and 1100? * - ANSWER-95 because it is -2 and 2 for z score
13. "We examine a population with normal distribution having a mean = 1,000 and
standard deviation = 50. What approximate percentage of the population lies
between 950 and 1050?" * - ANSWER-68 because it is -1 and 1 for z score
14. How are Z-scores from a population with a normal distribution distributed? * -
ANSWER-1. Normal Distribution with mean = 0 and standard deviation = 1
15. If we need to examine the relationship between age and salary, which of the
following would be most useful? * - ANSWER-Scatter plot
best to show relationships between 2 numeric variables
16. Consider a population with mean 100 and standard deviation of 10. If we
randomly select a data point from the population, what is the probability that the
point will be between 90 and 110? (Hint: consider the Z-scores)? * - ANSWER-
68%
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100% Pass
1. Which of the following statistics are unaffected by a single large outlier? (More
than one) * - ANSWER-Median, mode, Interquartile range (IQR)
2. Which of the following is most suitable for policy making based on income
distribution? * - ANSWER-Median
Because of assumed skewed distribution
3. If we study data from a population whose mean is 200 and standard deviation is
30, which of the following data points has a z-score of -3? * - ANSWER-110.
4. Which of the following statistics measures the spread of the dataset away from
mean? * - ANSWER-Variance
5. Which of the following are measures of spread or variability of a dataset? (More
than one) * - ANSWER-Variance, range, IQR
©️COPYRIGHT 2025, ALL RIGHTS RESERVED. 1
,6. An experiment consists of rolling a die and flipping a coin. Which two choices
below best apply for computing the probability of rolling a 6 on a die AND
flipping head on a coin? * - ANSWER-Multipication and Intersection
AND,BOTH, ALL: Multipication Probability A*Probably B
Mult goes with intersection
7. An experiment consists of rolling a die and flipping a coin. Which two choices
below best apply for computing the probability of rolling a 6 on a die OR flipping
head on a coin? * - ANSWER-Addition and Union
Probably A + Probably B
OR,EITHER: Addition, addition goes with union
The probability that a baby is a girl, given that the baby is wearing pink is 0.8. The
probability that a baby is a girl is 0.5. Which of the choices below best applies for
determining the probability that a baby is wearing pink GIVEN THAT the baby is
a girl? - ANSWER-Bayes Theorem
Probably A/(Probably A + B)
GIVEN THAT
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, 11. We examine a population with normal distribution having a mean = 1,000 and
standard deviation = 50. What approximate percentage of the population lies
between 850 and 1150? * - ANSWER-99.7 because it is -3 and 3 for z score
12. We examine a population with normal distribution having a mean = 1,000 and
standard deviation = 50. What approximate percentage of the population lies
between 900 and 1100? * - ANSWER-95 because it is -2 and 2 for z score
13. "We examine a population with normal distribution having a mean = 1,000 and
standard deviation = 50. What approximate percentage of the population lies
between 950 and 1050?" * - ANSWER-68 because it is -1 and 1 for z score
14. How are Z-scores from a population with a normal distribution distributed? * -
ANSWER-1. Normal Distribution with mean = 0 and standard deviation = 1
15. If we need to examine the relationship between age and salary, which of the
following would be most useful? * - ANSWER-Scatter plot
best to show relationships between 2 numeric variables
16. Consider a population with mean 100 and standard deviation of 10. If we
randomly select a data point from the population, what is the probability that the
point will be between 90 and 110? (Hint: consider the Z-scores)? * - ANSWER-
68%
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