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Math 3 Review: Statistics

Total questions: 25

Worksheet time: 2hrs 5mins

Name
Class
Date
1.
The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.
a)
 28,000 km and 32,000 km.
b)
24,000 km and 34,000 km.
c)
26,000 km and 34,000 km.
d)
27,000 km and 31,000 km.
2.
The normal curve is symmetrical about the mean.
a)
True
b)
False
3.
What is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2
(Put each value into data and look at Sx)
a)
7.83
b)
10.1
c)
7.26
d)
9
4.
The number of miles that Jenna cycled each week for a 7-week period is shown: 
36, 42, 28, 52, 48, 36, 31 
What is the median number of miles Jenna cycled?
a)
24
b)
36
c)
39
d)
52
5.
The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees.  Approximately what percent of days in February will have days below 23 degrees?
a)
5%
b)
34%
c)
50%
d)
68%
6.
What shape is a normal distribution curve?
a)
Half curve
b)
Round curve
c)
Bell curve
d)
Square curve
7.
The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?
a)
68%
b)
34%
c)
16%
d)
2.5%
8.
The Floppy Disk Company makes 3.5 inch floppy disks for disk drives that are 3.7 inches wide. The size of a manufactures disk is normally distributed with a standard deviation of 0.1 inches. The company manufactures 1000 disks every hour.

In one hour, how many disks would you expect to be between 3.4 inches and 3.7 inches?
a)
819 disks
b)
23 disks
c)
500 disks
d)
0 disks
9.

At a football game, a researcher

randomly asks 100 people to name

their favorite sport. Is this a biased

sample?

a)

Yes

b)

No

10.

Which of the following is a population?

a)

7th grade girls at a school

b)

7th grade boys at a school

c)

Teachers at a school

d)

All students at a school

11.

Which could be a sample?

a)

All students at Wake Forest

b)

Students in a sorority at Wake Forest

c)

All professors at Wake Forest

12.

A website asks a visitor to fill out an

online survey. Is this a random sample?

a)

Yes

b)

No, its voluntary

c)

No, its mandatory

13.
1. A sample in which every person, object, or event has an equal chance of being selected.
a)
A. Random sample.
b)
B. Biased sample.
14.
According to a random telephone survey of 200 adults, 75% of all working adults in the U.S. are satisfied with their current job. What is the population in this survey?
a)
200 adults
b)
adults in the U.S.
c)
75% of adults
15.
Zoie completes a report by asking 70 students across campus. She found that 48% of CTMS students do not wash their hands after using the bathroom. What is the sample size?
a)
48
b)
100
c)
70
d)
CTMS students
16.
Interview the first 30 students who enter the school in the morning. 
a)
simple random
b)
voluntary response
c)
systematic
d)
convenience
17.
Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected. 
a)
systematic
b)
random sample
c)
convenience
d)
volunteer response
18.
Disneyland often surveys its guests as they exit a restaurant during their visit. The surveyor stands at the restaurant exit, counts the number of people leaving, and surveys every 25th guest.
This is a form of:
a)
Random Sample
b)
Convenience Sampling
c)
Voluntary Response
d)
Systematic Sampling
19.
A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the first five who raise their hands.
a)
Systematic
b)
Convenience
c)
Voluntary Response
d)
Simple Random
20.
A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the five closest to her desk.
a)
simple random
b)
Voluntary Response
c)
Convenience
d)
Systematic Random
21.

An independent research company wants to go door to door to survey people in the city of Fontana. The company decides to number all blocks within the city limit, randomly choose 1 block and survey all households on that block.

This is an example of:

a)

Simple Random Sample

b)

Stratified Random Sample

c)

Cluster Random Sample

d)

Systematic Random Sampling

22.

A teacher wants to know how well her students are doing on a topic. She randomly picks one class to survey.

a)

Simple Random

b)

Cluster

c)

Stratified

d)

Systematic

23.

A teacher splits her classes up by period. She then randomly picks 3 students from each period to do a survey.

a)

Stratified.

b)

Systematic

c)

Cluster

d)

Biased.

24.
The conductor has no input or control over the environment in this situation
a)
census
b)
observational study
c)
experiment
d)
judgment
25.
The conductor has control over the environment in this setting
a)
experiment
b)
observational study
c)
population
d)
sample

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