Researchers often prefer to report cumulative

Researchers often prefer to report cumulative percents from the bottom up to explain
how certain scores rank at or below other scores in a distribution. What is this type of
Below is the number of times a commercial was shown displaying high fat, high sugar
foods during children's programming over each of 20 days.

11, 12, 6, 16, 3, 9, 14, 17, 21, 8,8, 11, 18, 19, 12, 10, 21, 5, 7, 22
(a) Create a simple frequency distribution for these grouped data with four intervals.
(b) Which interval had the largest frequency?=========(a)
Interval
18-22
13-17
8-12
3-7
Frequency
5
3
8
4
(b) Interval: 8-12
The upper boundaries for a distribution of waiting times (in seconds) in a grocery store
aisle are 44, 56, 68, and 80. List the value for each lower boundary in this
distribution.=========Lower Boundary
69
57
45
33
A researcher records the number of dreams that 50 college freshman students recalled
during the night prior to a final exam.
_____________________________________
Number of dreams
4
3
2
1
0
Cumulative Frequency
50
42
29
20
7
_________________________________
(a) Convert this table to a percentile rank distribution.
(b) What is the number of dreams at the 58th percentile?=========(a) Percentile Rank
100
84
58
40
14
(b) 2 dreams

Organize the following data into a stem-and-leaf display where the following is true.
(Enter numbers from smallest to largest separated by spaces. Enter NONE for stems
with no values.)
244, 119, 114, 243, 249, 247, 112, 174, 242, 179248, 174, 179, 118, 241, 115, 110,
178, 173, 175
(a) the stem has one digit=========(a)
Stem | Leaf
1 | 10 12 14 15 18 19 73 74 74 75 78 79 79
2 | 41 42 43 44 47 48 49
(b)
Stem | Leaf
11 | 0 2 4 5 8 9
17 | 3 4 4 5 8 9 9
24 | 1 2 3 4 7 8 9
The following is an incomplete simple frequency distribution table for the number of
mistakes made during a series of military combat readiness training exercises.
_____________________________________
Number of Mistakes
6 - A
B - 5
0 - 2
Frequency
2
4
C
N = 19
Find the missing values for A, B, and C.=========A = 8
B = 3
C = 13
The following bar graph summarizes the number of nights per week a sample of college
students spent studying.
(a) How many students were observed in this study? (Enter an exact number.)
(b) How many students studied 3 nights per week? (Enter an exact number.)
(c) How many students studied at least 3 nights per week? (Enter an exact
number.)=========(a) 35 students
(b) 6 students
(c) 14 students
Keith Rollag (2007) noticed that coworkers evaluate and treat "new" employees
differently from other staff members. He was interested in how long a new employee is
considered "new" in an organization. He surveyed four organizations ranging in size