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Stats 5/11/21

Total questions: 52

Worksheet time: 1hrs 3mins

Name
Class
Date
1.
This data is normally distributed.  What percent of the data is in the shaded region?
a)
68%
b)
95%
c)
99.7%
d)
50%
2.
This data is normally distributed.  What percent of the data is in the shaded region?
a)
68%
b)
95%
c)
99.7%
d)
50%
3.
If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall? 
a)
-5
b)
-2
c)
2
d)
5
4.
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.
5.
What shape is a normal distribution curve?
a)
Half curve
b)
Round curve
c)
Bell curve
d)
Square curve
6.

What is a hypothesis?

a)

the thing changed on purpose in the experiment

b)

an explanation about what you observed

c)

using your 5 senses to gather data

d)

an educated guess about the outcome of an experiment

7.

What two words should be in your hypothesis?

a)

I think

b)

If ...then...

c)

It will

d)

No idea

8.

What variable comes after the word IF

a)

independent variable

b)

dependent variable

9.

What variable comes after the word then?

a)

independent variable

b)

dependent variable

10.

When is a hypothesis written?

a)

before you decide on a question

b)

after the experiment

c)

before the experiment

d)

after the conclusion

11.

The independent variable is

a)

the part the scientist measures

b)

the part the scientist changes or is testing

c)

a letter

12.

Which hypothesis is correctly written?

a)

I think I will do well on my test today, because I ate a good breakfast.

b)

If I eat a good breakfast, then I will do well on my test today.

c)

If I eat a good breakfast, then I will earn a passing grade on my test today.

d)

If I do well on my test today, I get to out to eat for breakfast.

13.
What is definition of null hypothesis?
a)
The independent variable has no effect on the dependent variable for the population
b)
The independent variable does have an effect on the dependent variable
c)
The dependent variable has no effect on the independent variable
d)
The dependent variable does have effec on the independent variable
14.
Define a Type I error?
a)
The failure to reject a false null hypothesis
b)
Rejecting a true null hypothesis
c)
The acceptance to reject a null hypothesis
d)
Accepting a true null  hypothesis
15.
In a research report, the term "significant" is used when the null hypothesis is rejected.
a)
True
b)
False
16.
A z-score value in critical region means that you should reject the null hypothesis.
a)
True
b)
False
17.

A hypothesis is never wrong.

a)

True

b)

False

18.

Which step of the Scientific method will you form a hypothesis?

a)

8

b)

1

c)

5

d)

3

19.

Does the type of ball affect the bouncing height?

Which hypothesis is correct?

a)

If the subject bounces a ping pong ball, then the ping pong ball will bounce the highest.

b)

We use a big ball, the ball will bounce really high.

c)

She can use a basketball, then the ball will bounce the lowest.

d)

The subject uses a bowling ball, the bowling ball will bounce the lowest.

20.

The variable that is kept the same during the experiment

a)

Independent

b)

Controlled

c)

Manipulated

d)

Dependent

21.

Which one is a good hypothesis?

a)

If we mix blue and yellow water together, the water will turn green.

b)

We'll mix blue and yellow water together, then the water will turn green.

c)

If we mix blue and yellow water together, then the water will turn green.

22.

Which one is the best hypothesis?

a)

If we threw a pumpkin from a high building, then the pumpkin would smash into a million pieces on the sidewalk below.

b)

If we threw a pumpkin from a high building, then the pumpkin would float into the sky.

c)

If we threw a pumpkin from a high building, then the pumpkin would disappear.

23.

What is the first step of the scientific method?

a)

Hypothesize

b)

Ask Questions

c)

Test hypothesis

d)

Communicate results

24.

Which of the following is NOT a rule when writing a hypothesis?

a)

It is testable

b)

It is an if/then statement

c)

it should restate the question

d)

It is a prediction.

25.

Which of the following represents the appropriate null & alternative hypotheses?

The mean height of women is greater than 64"

a)

H₀: μ > 64"

Hₐ: μ ≠ 64"

b)

H₀: μ < 64"

Hₐ: μ > 64"

c)

H₀: p > 64"

Hₐ: p ≠ 64"

d)

H₀: p = 64"

Hₐ: p > 64"

26.

Which of the following represents the appropriate null & alternative hypotheses?

The mean height of women is greater than 64"

a)

H₀: μ > 64"

Hₐ: μ ≠ 64"

b)

H₀: μ < 64"

Hₐ: μ > 64"

c)

H₀: p > 64"

Hₐ: p ≠ 64"

d)

H₀: p = 64"

Hₐ: p > 64"

27.
When performing a test about the population proportion, what distribution would you need to use? 
a)
z
b)
t
c)
chi-square
28.
A P-value indicates:
a)
the probability that the null hypothesis is true
b)
the probability that the alternative hypothesis is true
c)
the probability of obtaining the results (or one more extreme) if the null hypothesis is true
d)
probability of a Type I error
29.

Which of the following refers to a type I error?

a)

When a researcher wrongly accepts the results as being significant.

b)

When a researcher wrongly accepts the results as not being significant.

30.

Which of the following refers to a type II error?

a)

When a researcher wrongly accepts the results as being significant.

b)

When a researcher wrongly accepts the results as not being significant.

31.

A type I error involves a researcher wrongly accepting which hypothesis?

a)

Alternative

b)

Null

32.

A type I error involves a researcher wrongly rejecting which hypothesis?

a)

Alternative

b)

Null

33.

A type I error is most likely to occur when a researcher has been too...

a)

Lenient

b)

Strict

34.

A type II error is most likely to occur when a researcher has been too...

a)

Lenient

b)

Strict

35.

What p-value do psychologists most commonly use?

a)

P<0.05

b)

P<0.01

c)

P<0.1

36.

Psychologists most commonly use the p-value of p<0.05 because it....

a)

Strikes a balance between making a type I and type II error

b)

Decreases the likelihood of making a type I error only

c)

Because it decreases the likelihood of making a type II error only

37.

The null hypothesis is represented by:

a)

Ha

b)

Ho

c)

t*

d)

HP

e)

μ

38.

The null hypothesis always contains a(an):

a)

< or >

b)

=

c)

>

d)

= or >

e)

≠

39.
How can you reduce both Type I and Type II errors?
a)
it can't be reduced
b)
redo the tests
c)
increase the sample size
d)
tamper with the data
40.
What do we use to estimate unknown parameters?
a)
Hypothesis Test
b)
Confidence Interval
c)
Trig Identity
d)
Guess and check
41.
The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 5.6 seconds?
a)
-1.33
b)
1.33
c)
0.88
d)
1.02
42.
Between what two standard deviations of a normal distribution contain 68% of the data?
a)
one below and one above
b)
two below and two above
c)
two below and zero
d)
zero and two above
43.
The average waist size for teenage males is 29 inches with a standard deviation of 1.4 inch. 
If waist sizes are normally distributed, estimate the proportion of teenagers who will have waist sizes greater than 31 inches?
a)
92.4%
b)
10.5%
c)
16%
d)
7.6%
44.
What is the the total area under the standard normal distribution curve?
a)
100
b)
25
c)
.5
d)
1
45.
The z-score represents.....
a)
the amount of standard deviations a data value is above or below the mean.
b)
the percentile the data value is above or below the mean.
c)
the amount of standard deviations a data value is above or below the median.
d)
the percent the data value is above or below the mean.
46.
Which is NOT true about the standard normal distribution?
a)
It is bell-shaped.
b)
It is unimodal.
c)
The mean is 0 and the standard deviation is 1.
d)
It is asymmetrical.
47.

If I tell you that you scored at the 55th percentile on your final exam, you would know:

a)

55% of the class scored the same or worse than you did

b)

You earned a 55% on the exam

c)

You failed the exam

d)

45% of the class scored worse than you did

48.
These symbols represent the mean and standard deviation for which of the following distributions?
a)
The Population
b)
The Sample
c)
The Sampling Distribution
49.

Name this symbol:

a)

Triskelion

b)

Infinity

c)

Holy Trinity

d)

Lotus

50.

Define the symbol.

a)

population standard deviation

b)

sample standard deviation

c)

population mean

d)

population proportion

51.

Define the symbol.

a)

population mean

b)

sample size

c)

sample mean

d)

sample standard deviation

52.

Define the symbol

a)

sample mean

b)

population mean

c)

sample proportion

d)

population proportion

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