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Math 6 > Unit 7 > Flashcards

Unit 7 Flashcards

(103 cards)

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1
Q

A way to organize data values into categories or groups.

A

Frequency table

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2
Q

The ______________ of a data value is the number of times it occurs.

A

frequency

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3
Q

By including a ______________ column in your frequency table, you can keep a running total of the number of data items.

A

cumulative frequency

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4
Q

The word ______________ comes from the Latin word medius, meaning “middle.”

A

median

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5
Q

What is the median value in a set of data?

A

The value in the middle, when the data is ordered from least to greatest

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6
Q

______________ can mean “to spread out” or “to occur at random.”

A

Scatter

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7
Q

What might the data points on a scatter plot look like?

A

The data points could be all over, or “scattered” about.

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8
Q

______________ is a measure of how often an event occurs or the number of like objects that are in a group.

A

Frequency

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9
Q

What do you think a frequency table might show?

A

How often a specific thing occurs or how many of each object there are in a data set.

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10
Q

A ______________ uses the digits of each number to organize and display a set of data.

A

stem-and-leaf plot

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11
Q

On a stem-and-leaf plot, each ______________ on the plot represents the right-hand digit in a data value, and each ______________ represents the remaining left-hand digits.

A

leaf; stem

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12
Q

True or False: Each leaf in a stem-and-leaf plot must be one digit and only one digit.

A

True

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13
Q

Similar to a stem-and-leaf plot, a ______________ can be used to show how many times each data value occurs.

A

line plot

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14
Q

______________ use a number line and X’s to show frequency.

A

Line plots

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15
Q

True or False: By looking at a line plot, you can quickly see the distribution, or spread, of the data.

A

True

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16
Q

The ______________ is the sum of the data values divided by the number of data items.

A

mean

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17
Q

Data set: 2, 1, 8, 0, 2, 4, 3, 4
2 + 1 + 8 + 0 + 2 + 4 + 3 + 4 = 24
24 / 8 = 3
The ______________ is 3.

A

mean

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18
Q

The ______________ is the middle value of an odd number of data items arranged in order.

A

median

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19
Q

For an even number of data items, the ______________ is the mean (average) of the two middle values.

A

median

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20
Q

Data set: 2, 1, 8, 0, 2, 4, 3, 4
0, 1, 2, 2, 3, 4, 4, 8
(2 + 3) / 2 = 2.5
The ______________ is 2.5.

A

median

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21
Q

The ______________ is the value or values that occur most often.

A

mode

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22
Q

True or False: When all the data values in a set occur the same number of times, there is a mode.

A

False. When all the data values in a set occur the same number of times, there is NO mode.

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23
Q

Data set: 2, 1, 8, 0, 2, 4, 3, 4
0, 1, 2, 2, 3, 4, 4, 8
The ______________ are 2 and 4.

A

modes

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24
Q

The ______________ of a set of data is the difference between the greatest and least values.

A

range

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25
Data set: 2, 1, 8, 0, 2, 4, 3, 4 8 - 0 = 8 The ______________ is 8.
range
26
An extreme value in a data set that is either much greater or much less than the other values is called an ______________.
outlier
27
In the data set {0, 1, 1, 1, 1, 2, 2, 2, 3, 3, 5, 7, 7, 14, 14} the outlier is ______________.
14
28
In the data set {1, 2, 3, 4, 5} the median is ______________.
3
29
In the data set {1, 2, 3, 4, 5} the mode is ______________.
There is no mode.
30
True or False: A bar graph can be used to display and compare data.
True
31
The scale of a bar graph should include all the data values and be easily divided into (equal / unequal) intervals.
equal
32
You can use a ______________ to compare two related sets of data.
double-bar graph
33
A ______________ is a bar graph that shows the frequency of data within equal intervals.
historgram
34
True or False: There is space between the bars in a histogram.
False. There is NO space between the bars in a histogram.
35
A ______________, also called a pie chart, shows how a set of data is divided into parts.
circle graph
36
The entire circle in a circle graph contains 100% of the data. Each ______________, or slice, of the circle represents one part of the entire data set.
sector
37
A pie chart is also called a ______________.
circle graph
38
Each slice of a pie chart is also called a ______________.
sector
39
True or False: A box-and-whisker plot uses a number line to show the distribution of a set of data.
True
40
To make a ______________, first divide the data into four parts using quartiles. The median, or middle quartile, divides the data into a lower half and an upper half. The median of the lower half is the ______________ quartile, and the median of the upper half is the ______________ quartile.
box-and-whisker plot; lower; upper
41
In a box-and-whisker plot, the median of the lower half is the ______________.
lower quartile
42
In a box-and-whisker plot, the median of the upper half is the ______________.
upper quartile
43
The ______________ of a data set is the difference between the lower and upper quartiles.
interquartile range
44
In a ______________, line segments are used to connect data points on a coordinate grid.
line graph
45
True or False: A line graph shows a visual record of change.
True
46
True or False: You can use a line graph to estimate values between data points.
True
47
A ______________ shows change over time for two sets of data.
double-line graph
48
When information is gathered about a group, such as all the elk in North America, the entire group is called the ______________.
population
49
Because testing each member of a large group can be difficult or impossible, researchers often study a part of the population, called a ______________.
sample
50
For a ______________, members of the population are chosen at random.
random sample
51
A ______________ sample is more likely to be representative of a population than a ______________ sample is.
random; convenience
52
In a ______________, every member of the population is given an equal chance of being chosen.
random sample
53
A ______________ is based on members of the population that are readily available, such as 10 classmates in your current class if the population is the entire school.
convenience sample
54
A ______________ does not fairly represent the population.
biased sample
55
The first 50 people exiting a movie are surveyed to find out what type of movie people in the town like to see. Is this a biased sample?
Yes, the sample is biased. It is likely that not everyone in the town likes to see the same type of movie that those 50 people just saw.
56
A librarian randomly chooses 100 books from the library's database to calculate the average length of a library book. Is this a biased sample?
No, the sample is not biased. It is a random sample.
57
A ______________ has two number lines, called axes - one for each set of data values. Each point on it represents a pair of data values.
scatter plot
58
Two sets of data, such as the length and the weight of dinosaurs, may be related. To find out, you can make a ______________ of the data values in each set.
scatter plot
59
In a ______________, the points may appear to be scattered or may cluster in the shape of a line or a curve.
scatter plot
60
A ______________ is the description of the relationship between two data steps.
correlation
61
There are three types of ______________ that can describe data displayed in a scatter plot.
correlations
62
When the values in both data sets increase at the same time, it is called a ______________.
positive correlation
63
When the values in one data set increase as the values in the other set decrease, it is called a ______________.
negative correlation
64
When the values in both data sets show no pattern, there is ______________.
no correlation
65
What type of correlation is this? ``` | * * | ** * | * | * * |___________ ```
positive correlation
66
What type of correlation is this? ``` | * * | ** * | * | * * |___________ ```
negative correlation
67
What type of correlation is this? ``` | * * * * | * ** * | * * * * | * * * ** * |___________ ```
no correlation
68
A ______________ is a straight line that comes closest to the points on a scatter plot.
line of best fit
69
When gathering information about a(n) ______________, researchers often study part of the group, called a(n) ______________.
population; sample
70
The sum of the data values divided by the number of data items is called the ______________ of the data.
mean
71
A graph that uses vertical or horizontal bars to display data.
bar graph
72
A sample that does not fairly represent the population.
biased sample
73
A graph shows how data are distributed by using the median, quartiles, least value, and greatest value; also called a box plot.
box-and-whisker plot
74
A graph that uses sectors of a circle to compare parts to the whole and parts to other parts.
circle graph
75
A sample based on members of the population that are readily available.
convenience sample
76
The description of the relationship between two data sets.
correlation
77
The frequency of all data values that are less than or equal to a given value.
cumulative frequency
78
A bar graph that compares two related sets of data.
double-bar graph
79
A line graph that shows how two related sets of data change over time.
double-line graph
80
The median of the lower half of a set of data; also called first quartile.
lower quartile
81
The number of times the value appears in the data set.
frequency
82
A table that lists items together according to the number of times, or frequency, that the items occur.
frequency table
83
A bar graph that shows the frequency of data within equal intervals.
histogram
84
The difference between the upper and lower quartiles in a box-and-whisker plot.
interquartile range
85
A graph that uses line segments to show how data changes.
line graph
86
A straight line that comes closest to the points on a scatter plot.
line of best fit
87
A number line with marks or dots that show frequency.
line plot
88
The sum of the items in a set of data divided by the number of items in the set; also called average.
mean
89
The middle number, or the mean (average) of the two middle numbers, in an ordered set of data.
median
90
The number or numbers that occur most frequently in a set of data; when all numbers occur with the same frequency; we say there is no _______.
mode
91
When one set of data values increases while the other decreases.
negative correlation
92
When there is no relationship between the data values of two data sets.
no correlation
93
A value much greater or much less than the others in a data set.
outlier
94
The entire group of objects or individuals considered for a survey.
population
95
When the data values of two data sets both increase or both decrease together.
positive correlation
96
Three values, one of which is the median, that divide a data set into fourths.
quartile
97
A sample in which each individual or object in the entire population has an equal chance of being selected.
random sample
98
The difference between the greatest and least values in a data set.
range
99
A part of a population.
sample
100
A graph with points plotted to show a possible relationship between two sets of data.
scatter plot
101
A section of a circle graph representing part of the data set.
sector
102
A graph used to organize and display data so that the frequencies can be compared.
stem-and-leaf plot
103
The median of the upper half of a set of data; also called the third quartile.
upper quartile

Math 6 (2 decks)

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