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PSSA Math 8th Grade - Statistics and Probability Flashcards | StudBud
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PSSA Math 8th Grade - Statistics and Probability
PSSA Math 8th Grade - Statistics and Probability
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Answers
1
Which approximation is closest to the percent of the students who chose pepperoni pizza as their favorite?
87\%
47\%
53\%
50\%
2
On which day was the rainfall recorded an outlier?
7
1
20
17
3
Which of the following is
not
a categorical variable?
time spent practicing a musical instrument
hair color
favortie kind of movie
U.S. region of residence
4
What percent of those surveyed prefer seeing live music at a concert?
25%
75%
50%
40%
5
Which could be the slope for the line of best fit?
m = \frac{1}{2}
m = -1
m = -\frac{1}{2}
m = 1
6
Which statement about the lines of best fit for the two data sets is
most likely
true?
The y-int. and the slopes of the best fit lines both differ by 4.
The y-int. of the best fit lines differ by 4, but the slopes are the same.
The lines of best fit for data sets A and B are the same line.
The slope of the best fit line for A is 4, and for B is \frac{1}{4}.
7
Read and solve the following:
A $2 increase in cost/ticket, the # of tickets sold increased by 26.5.
A $2 increase in cost/ticket, the # of tickets sold decreased by 26.5.
A $1 increase in cost/ticket, the # of tickets sold increased by 26.5.
A $1 increase in cost/ticket, the # of tickets sold decreased by 26.5.
8
What are the values of
a
,
b
, and
c
?
a = 49, b = 102, c = 120
a = 31, b = 84, c = 14
a = 289, b = 236, c = 120
a = 31, b = 84, c = 120
9
How many of the students Blake interviewed participate in sports?
4
10
14
15
10
Which set of data is
most likely
to show a negative linear relationship on a scatter plot?
pages left to read in a book for different number of days
height of bean plants for various numbes of weeks
quiz scores for different amounts of time spent studying
distances run by an athlete for different time intervals
11
A scatter plot is graphed on the coordinate grid shown below. Which equation best describes a line of best fit?
y = 0.8x + 8
y = –8x + 0.8
y = –0.8x + 8
y = 8x + 0.8
12
Which equation could represent the best fit line for the temp., in Fahrenheit, based on the altit., in thousands of ft?
y=-5x+69
y=-\frac{7}{2}x+59
y=-5x+80
y=-\frac{9}{4}x+47
13
Read and solve the following:
5
3
6
4
14
A student spends 7 hrs playing sports. According to the best fit line, how many hrs will they spend doing homework?
about 8.5 hours
about 7 hours
about 12 hours
about 11 hours
15
Christy created the scatter plot shown below
The slope would increase because the point lies below the original line.
The slope would increase because the point lies above the original line.
The slope would decrease because the point lies below the original line.
The slope would decrease because the point lies above the original line.
16
Which equation is best to estimate the number of text messages,
y
, that a person
x
years of age recieves in a day?
y = -x + 73
y = -x - 63
y = x + 70
y = -x + 63
17
Based on the information shown in the two-way table, which statement about the families surveyed is true?
Of all the families, more than\frac{1}{2} have neither a cat nor a dog.
Of all the families surveyed who do not have a dog, \frac{3}{4} have a cat.
Of all the families surveyed, 32% have either a cat or a dog, but not both.
Of all the families surveyed who do have a cat, 12% do not have a dog.
18
Using a line of best fit, how many points should Denise expect to score after she practices for 3 hours?
10
16
7
12
19
According to the line of best fit, about how many text messages does a person 17 years of age receive in a day?
53
82
46
65
20
Based on the scatter plot, which statement is true?
There are not enough data points to determine correlation.
The data show no correlation.
The data show a positive correlation.
The data show a negative correlation.
