chapter two-text

Question 1

frequency distribution

Answer 1

an organized tabulation of the number of individuals located in each category on the scale of measurement

Question 2

percentile rank

Answer 2

defined as the percentage of individuals in the distribution with scores at or below the particular value

Question 3

percentile

Answer 3

this is when a score is identified by its percentile rank

Question 4

if the following sores are placed in a frequency distribution table, then what is the frequency value corresponding to X=3? scores: 2, 3, 1, 1, 3, 3, 2, 4, 3, 1
a. 1
b. 2
c. 3
d. 4

Answer 4

d. 4

Question 5

for the following distribution that reports the number pf smiles displayed a childcare worker to a baby in a 20-minute time frame, how many smiles were observed?
x=5,4,3,2,1
f=6,5,5,3,2
a. 5
b. 10
c. 15
d. 21

Answer 5

d. 21

Question 6

in a distribution of exam scores, which of the following would be the highest score?
a. the 20th percentile
b. the 80th percentile
c. a score with a percentile rank of 15%
d. a score with a percentile rank of 75%

Answer 6

b. the 80th percentile

Question 7

following are three row from a frequency distribution table. for this distribution, what is the 90th percentile?
x=30-34, 25-29, 20-24
c%=100%, 90%, 60%
a. X=24.5
b. X=25
c. X=29
d. X=29.5

Answer 7

d. X=29.5

Question 8

a set of scores ranges from a high of X=86 to a low of X=17. if these scores are placed in a grouped frequency distribution table with an interval width of 10 points, the top interval in the table would be _______.
a. 80-89
b. 80-90
c. 81-90
d. 77-86

Answer 8

a. 80-89

Question 9

what is the highest score in the following distribution?
x=24-25, 22-23, 20-21, 18-19, 16-17
f=2, 4, 6, 3, 1

Answer 9

d. cannot be determined

Question 10

which of the following statements is FALSE regarding grouped frequency distribution tables?
a. an interval width should be used that yields about 10 intervals
b. intervals are listed in descending order, starting with the highest values at the top of the x column
c. the bottom score for each interval in a multiple of the interval width
d. the value for n can be determined by counting the number of intervals in the x column

Answer 10

d. the value for n can be determined by counting the number of intervals in the x column

Question 11

what graphs are used for interval or ratio data?

Answer 11

histograms, informal histograms, frequency distribution polygons

Question 12

formula to find the midpoint

Answer 12

(lowest interval + highest interval)/2

Question 13

what graphs are used for nominal or ordinal data?

Answer 13

bar graphs

Question 14

what graphs are used for population distributions?

Answer 14

relative frequency distribution, smooth curves

Question 15

symmetrical distribution

Answer 15

it is possible to draw a vertical line through the middle so that the distribution is a mirror image of the other

Question 16

skewed distribution

Answer 16

the scores tend to pile up toward one end of the scale and gradually taper off at the other end

Question 17

tail of the distribution

Answer 17

the section where the scores taper off toward on end of a distribution

Question 18

positively skewed

Answer 18

the tail on the right-hand side

Question 19

negatively skewed

Answer 19

the tail on the left-hand side

Question 20

which of the following measurement scales are displayed by frequency distribution polygons?
a. either interval or ratio scales
b. only ratio scares
c. either nominal or ordinal scales
d. only nominal scales

Answer 20

a. either interval or ratio scales

Question 21

a group of quiz scores is shown in a histogram. if the bars in the histogram gradually increase in height from left to right, what can you conclude about the set of quiz scores?
a. there are more high scores than there are low scores
b. the are more low scores than there are high scores
c. the height of the bars always decreases as the scores increase
d. none of the above

Answer 21

a. there are more high scores than there are low scores

Question 22

instead of showing the actual number of individuals in each category, a population frequency distribution graph usually shows a(n) _______.
a. estimated frequency
b. grouped frequency
c. relative frequency
d. hypothetical frequency

Answer 22

c. relative frequency

Question 23

in a distribution with a negative skew, where are the scores with the highest frequencies located?
a. on the right side of the distribution
b. on the left side of the distribution
c. in the middle of the distribution
d. represented at two distinct peaks

Answer 23

a. on the right side of the distribution

Question 24

for the scores shown in the following stem and leaf display, what is the lowest score in the distribution?
9 374
8 945
7 7042
6 68
5 14
a. 7
b. 15
c. 50
d. 51

Answer 24

d. 51

Question 25

for the scores shown in the following stem and leaf display, how many people had scores in the 70s?
9 374
8 945
7 7042
6 68
5 14
a. 1
b. 2
c. 3
d. 4

Answer 25

d. 4