A relative frequency distribution was constructed for a sample of size n = 120 . The relative frequency for the third class was 0.15 . How many items of data fell into the third class?
Q. 2What is the largest possible value needed on the vertical axis of a relative frequency histogram?
Q. 3Explain the difference between a J-shaped histogram and a skewed histogram.
Q. 4Which is the depth of the 5th percentile for a ranked set of 35 student weights?
a. 1.50
b. 2.00
c. 2.50
d. 3.00
Q. 5Which of the following statements is false?
a. The 5-number summary is more informative when it is displayed on a diagram drawn to scale. A computer-generated graphic display that accomplishes this is known as the box-and-whiskers display.
b. The position of a specific value in a set of data can be measured in terms of the mean and variance using the standard score, commonly called the z-score.
c. The z-scores are typically range in value from approximately -3.00 to +3.00 .
d. None of the above
Q. 6The 5-number summary divides a set of data into how many subsets?
a. 6
b. 5
c. 4
d. 3
Q. 7If the 70th percentile for a set of exam scores is 82, what does this mean?
a. At most 70 of the exam scores are smaller in value than 82
b. At most 82 of the exam scores are smaller in value than 70
c. At least 70 of the exam scores are larger in value than 82
d. At least 82 of the exam scores are larger in value than 70
Q. 8Which is the depth of the 65th percentile for a ranked set of 50 student ages?
a. 32.5
b. 33.0
c. 33.5
d. 34.0
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