In a survey, students are asked how many hours they study in a typical week. A five-number summary of the responses is: 2, 9, 14, 20, 60 . Which interval describes the number of hours spent studying in a typical week for about 50 of the students sampled?
a. 2 to 9
b. 9 to 14
c. 9 to 20
d. 14 to 20
Q. 2A five-number summary given in Case Study 1.1 for the fastest ever driving speeds reported by 102 women was: 30, 80, 89, 95, 130 . Fill in the blank in the following sentence: Approximately 25 of the women reported a fastest ever driving speed of at most _____ mph.
a. 30
b. 80
c. 89
d. 95
Q. 3A five-number summary given in Case Study 1.1 for the fastest ever driving speeds reported by 102 women was: 30, 80, 89, 95, 130 . Fill in the blank in the following sentence: Approximately 25 of the women reported a fastest ever driving speed of at least _____ mph.
a. 25
b. 80
c. 89
d. 95
Q. 4A five-number summary given in Case Study 1.1 for the fastest ever driving speeds reported by 102 women was: 30, 80, 89, 95, 130 . What is the interquartile range of these data?
a. 6
b. 9
c. 15
d. 100
Q. 5A five-number summary for a data set is 35, 50, 60, 70, 90 . About what percent of the observations are between 35 and 90?
a. 25
b. 50
c. 95
d. 100
Q. 6The percent of data which lie between the lower and upper quartiles is
a. 10.
b. 25.
c. 50.
d. 75.
Q. 7Which of the following is not a term used for a quantitative variable?
a. Measurement variable
b. Numerical variable
c. Continuous variable
d. Categorical variable
Q. 8Which one of the following variables is not categorical?
a. Age of a person.
b. Gender of a person: male or female.
c. Choice on a test item: true or false.
d. Marital status of a person (single, married, divorced, other)
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