MAT 142 – October 18, 2011
MAT142
Name:________________
MAT 142 Intro to Statistics Worksheet
1. Consider the set of test scores shown below
88
71
92
98
82
72
93
74
95
71
91
100 92
83
95
46 83
93
100 88
95
50
93
75
86
84
49
92
98
83
89
49
98
90
76
87
80
50
89
48 83
96
92 86
66
99
99 96 84
100 71
94 96 91
99
100 87
89 92
97 84
71
94
73
62
96
90
72
85
100
94
70
94
87
61
59
90
99
(a) Organize the test data into a frequency table. Use classes of width 10, starting with 40. Include columns
for both the frequency and the relative frequency
(b) Use the frequency distribution in part (1) to create a frequency histogram of the data. Remember to give
your chart a title and to label your axes.
(c) Create a stem-and-leaf diagram of the test data.
(d) From the stem-and-leaf diagram, state the median and mode of the above test data.
Median =
Mode =
2. The following is the IQ test score for a random sample of 10 fifth -grade students:
90, 110, 118, 120, 122, 125, 126, 130, 135, 138
a) Give the 5-number summary of the data (MIN, MAX, Median, Q1 and Q3) and make a box plot.
MIN =
MAX=
Median=
Q1=
Q3=
Box plot (use the scale below to help, but draw the box plot above the scale, not on it.):
3.
The histogram below shows the number of people who signed up for an aerobics class:
(a) How many people signed up who were aged 40 or below?
(b) How many total people signed up?
(c) In what age range would the median age be found in?