Week 3: quiz 3

Statistics Questions

Question 1

Which of the following statistics is NOT a measure of central tendency?

• a. Arithmetic Mean
• b. Median
• c. Third Quartile (Q3)

Question 2

Which of the following methods represent central tendency?

• a. Quartiles, range, variance
• b. Coefficient of variation, Z scores, standard deviation
• c. Mean, median, mode

Question 3

In a right-skewed distribution:

• a. The mean is equal to the median
• b. The mean is greater than the median
• c. The mean is less than the median

Question 4

Which of the following methods represent variation and shape?

• a. Mean, median, mode
• b. Variance, standard deviation, coefficient of variation
• c. Covariance, coefficient of correlation

Question 5

According to the empirical rule, if the data form a bell-shaped normal distribution, what percentage of observations will be within 2 standard deviations of the mean?

• a. 95.44
• b. 68%
• c. 99.7%

Question 6

According to the Chebyshev rule, at least 75% of all observations are within how many standard deviations of the mean?

• a. 1
• b. 2
• c. 3

Question 7

A boxplot is a graphical representation of the five-number summary.

• a. False
• b. The information is not sufficient
• c. True

Question 8

What is kurtosis?

• a. The measure of the skewness of data values
• b. The measure of range of the data values
• c. The measure of the peakedness of the distribution curve

Question 9

What does the Z-score measure?

• a. The difference between a value and the mean, divided by the standard deviation
• b. A value that is extremely different from the rest
• c. All the above

Question 10

What does the coefficient of variation measure?

• a. The size of variation
• b. The range of variation
• c. The scatter of the data relative to the mean

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