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Statistics
Statistics
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Learning the basics of statistics
Flashcards
29 cards
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Practice quiz
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Questions
29
Answers
1
A one word description of MODE is...
LARGEST
DIFFERENCE
MOST
MIDDLE
2
In statistics, population is...
How many people live in a town
A sample that is randomly selected
A group selected from a larger group
Entire collection from which we collect data
3
Who's baby face is this?
Obama
Drake
Bruno Mars
Usher
4
Which of the following statements best describes simple random sample?
surveying everyone in the population
voluntary sample
selecting every third person
allows an equal change of being chosen
5
Which of the following distributions represent a normal distribution?
GRAPH B
GRAPH D
GRAPH C
GRAPH A
6
What does it mean when a test statistic fall in the rejection region?
reject the null hypothesis
reject the alternative hypothesis
7
A _________________is a question that requires only two possible answers.
Sample
Binary question
Survey
Unbiased question.
8
Would we want to increase or decrease alpha if we want be even more sure that H
A
is true?
Decrease
Increase
9
What is the range of the following number? $3.50, 3.50, 3.50, 4.00, 4.00, 5.00
$2.50
$5.00
$1.50
$3.50
10
students spend less than 3 hours at home doing homework assignments
HA: alternative hypothesis
H0: null hypothesis
11
Who's baby face is this?
Rihanna
Tyra Banks
Nicki Minaj
Beyonce
12
What type of graph is shown?
uniform
skewed left
skewed right
bimodal
13
When rolling a 12-sided die, what is the probability of getting an even number?
1/2
1/12
5/12
1/6
14
What is the z-score for a 95% confidence level?
1.64
1.96
1.99
1.46
15
A one word description of MEAN is...
SUM
MOST
MIDDLE
AVERAGE
16
when it comes to pets, do you prefer cats? What type of bias is present in this situation?
Nonresponse
Undercoverage
Leading Question
Voluntary Response
17
When do we use a t-table?
sample size greater than 30
sample size less than 30
18
The mean age of boys in the basketball team is 12 with a SD of 2 years.
The probability of a boy between 10-14 years old is 95%
The probability of a boy between 10-14 years old is 99.73%
The probability of a boy between 10-14 years old is 68%
The probability of a boy between 10-14 years old is 100%
19
What is the total probability under the normal curve?
100%
95%
99%
1%
20
The average high school senior weights at least 105 pounds
HA: μ ≥ 105
H0: μ ≤ 105
HA: μ ≥ 105
H0: μ ≥ 105
21
According to the graph displayed, what is the mode?
5
9
3
7 & 8
22
What type of graph is shown?
unimodal
bimodal
normal
uniform
23
What is a parameter?
A confidence interval of a population
A measurable characteristic of a sample
A confidence interval of a sample
A measurable characteristic of a population
24
A z-score is also known as...
standard deviation
confidence level
degrees of freedom
probability
25
What effect does the sample size, n, have on the width/range of the confidence interval?
As n decreases the CI also decreases
As n increases the CI also increases
As n increases the CI decreases
n has no effect on the width/range of the CI
26
___________________ is use to determine how confidence we are that a claim is true.
sampling
z-test
confidence intervals
hypothesis testing
27
45% of HS students play sports. What is the proportion of students that don't play sports?
5%
45%
100%
55%
28
You have 2 green pens, 4 blue pens, and 5 red pens in a bag. Which statement is true?
The probability of grabbing a red pen is 5/5
The probability of grabbing a green pen is 2/10
The probability grabbing a green pen is 1/2
The probability of grabbing a blue pen is 4/11
29
Do we have to always use a significance level of 0.05 when conducting a hypothesis test?
No
Yes
