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Six children have collected these amounts in their piggy banks: $10, $33, $45,
$23, $1, and $68. What is the median of their savings?
a. $28
b. $33
c. $23
d. $66
answer: a. $28
Rearrange the numbers in increasing order: 1, 10, 23, 33, 45, and 68. The median of a
sequence of numbers is the middle value. Since there are six numbers, there are two
values in the middle 23 and 33 and, therefore, the median is the average of these
values. The median is 28.
What do you call questions that have more than one possible answer, and require
collection of data to reach a valid answer?
a. probing questions
b. statistical questions
,c. non-statistical questions
b. rhetorical questions
answer: b. statistical questions
A non-statistical question just has one answer that does not change. A rhetorical
question does not require to be answered. Probing questions require elaboration of the
topic.
The weights of twenty trouts were recorded: 12, 13, 13, 14, 14, 14, 14, 15, 15, 15,
16, 16, 16, 17, 17, 17, 17, 17, 18, and 34. If the weight of the heaviest trout is
removed from the data, which statistical parameter will drastically change?
a. range
b. median
c. mean
d. mode
answer: a. range
Since the mean, median, and mode are measures of center, outliers will not have much
effect. The range will be greatly affected since it measures the difference between the
highest and lowest.
, Which of the following is the term used for the intersection of the x-axis and the
y-axis?
a. quadrant
b. coordinate
c. abscissa
d. origin
answer: d. origin
Abscissa refers to the x-axis, while ordinate refers to the y-axis. Quadrant refers to the
four sections in the Cartesian plane that are divided by the two axes.
What shape is obtained by drawing the polygon whose vertices are the points of
coordinates (2,0), (0,2), (-2,0), and (0,-2)?
a. square
b. rectangle
c. parallelogram
d. trapezoid
answer: a. square
The polygon determined by the four points is a square