Which is an example of a population?

All of the students at the school

A random sample of people at a mall shows 40% prefer travel by car. How many out of 500 by car?

200 families prefer travel by car

Ki surveys friends in art club whether they are attending an arts festival. All plan to attend.

Ki only asked the art club, so the survey is biased

A random sample shows 5 like rap, 10 hip hop, and 15 rock. You can conclude that ½ prefer rock.

The sample is unbiased so the conclusion is valid.

ask every tenth student she sees at a concert

Basketball Players are taller, Soccer players' height has a greater range of heights.

To evaluate cell phone quality, every 50th phone is checked. 4 out of 200 are defective.

Concluding 2% are defective is valid due to random sample

An example of a biased sample could be. . .

Surveying the 7th graders in the cafeteria

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Duplicate of 7th Grade Statistics & Probability

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7th grade Statistics and Probability review

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Questions 17

Answers

1
Mean.....
79.75
78
84
81.25
2
Which is an example of a population?
Students in drama club
The students attending Math Lab
The students in 6th period math class
All of the students at the school
3
Find the MAD of this data set. 5, 6, 8, 5.
1.5
1
6
2
4
Lunch!!
2
1
3
5
A random sample of people at a mall shows 40% prefer travel by car. How many out of 500 by car?
300 people prefer travel by bus
200 families prefer travel by plane
200 families prefer travel by car
250 people prefer travel by car
6
Ki surveys friends in art club whether they are attending an arts festival. All plan to attend.
Ki can assume that all students at school will attend
Ki only asked the art club, so the survey is biased
The kids probably just said they're going, but they won't
Ki's sample is random so he can plan on entire school going
7
A random sample shows 5 like rap, 10 hip hop, and 15 rock. You can conclude that ½ prefer rock.
The sample wasn't random.
The sample is unbiased but the conclusion is invalid.
The sample is biased so no conclusions possible.
The sample is unbiased so the conclusion is valid.
8
If 32% would buy a CD if they were given $20, how many out of 60,000 would buy a CD?
48,000
40,800
19,200
12,000
9
Median...
81
81.5
80
82
10
Giving a survey....
ask every tenth student she sees at a concert
ask every fifth student entering her school in the morning
ask every third student she encounters at the mall
ask every student at a local movie theater
11
What is the best measure of center for the double box plots below?
Mean
all of the above
Median
Mode
12
Mode....
81, 84
none
81, 82, 84
84
13
A survey found that 85% of students use emoticons. Out of 1,000 students, how many would use?
1,850 students
8 students
85 students
850 students
14
Inferences......
Soccer Players are taller.
Basketball players' height has a greater range of heights.
Basketball Players are taller
Soccer players' height has a greater range of heights.
15
To evaluate cell phone quality, every 50th phone is checked. 4 out of 200 are defective.
The sample wasn't random so you can't make conclusions
You would need to check more phones to be able to tell
Concluding 10% are defective is valid due to random sample
Concluding 2% are defective is valid due to random sample
16
An example of a biased sample could be. . .
Surveying every 10th person to walk into a department store
Surveying 2 people from each city in Florida
Surveying the 7th graders in the cafeteria
Surveying all of the students in a school
17
Predict how many students out of 500 will enter the medical field. (50 surveyed)
110 students
550 students
50 students
5,102 students

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