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Introduction to Statistics Game Flashcards | StudBud
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Introduction to Statistics Game
Introduction to Statistics Game
62 terms
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62 cards
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Practice quiz
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Questions
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Answers
1
Which sample is biased?
Random from all students
Every 10th student on list
Randomly chosen from homerooms
Only students in AP classes
2
Chi-square uses:
Means
Categorical data
Number only
Slopes
3
The probability distribution is used to model the number of heads when a coin is flipped 5 times.
geometric
Binomial distribution
Uniform distribution
Normal distribution
4
Chi-Square values are always:
Less than 1
Positive
Negative
Zero
5
If a population has a mean of 100, what is the mean of the sampling mean?
0
50
Random
100
6
Which Z score is the lowest?
A) 1
D) 3
C) -2
B) 0
7
What is t* used for?
Building a confidence interval
Finding the mean
Counting data
Making a sandwich
8
what does a dotplot show?
C) It shows each data point with dots stacked for frequency
D) It is used only for categories
B) It groups data into intervals
A) It shows the mean, median, and mode auotmatically
9
True or False: Mount Everest is the tallest mountain in the world.Β
False
True
10
In a race, runners are ranked 1st, 2nd, and 3rd. What type of variable is the ranking?
A) Discrete Variable
A) Nominal Variable
C) Continuous Variable
B) Ordinal Variable
11
If the sample is not Random, the results might be biased.
True
False
12
What shape is this?
C) Uniform
B) Skewed left
D) Symmetric
A) skewed right
13
More practice --> better piano playing. What's the relationship?
π΄πͺ
Positive
None
Negative
14
True or False: One-tailed test checks in one direction.
False
True
15
The standard deviation of the sampling distribution is called the:
Population spread
Standard error
Margin of mean
Mean error
16
The p-value tells you the probability that the null hypothesis is true.
False
True
17
What is the probability of rolling a 6 on a die?
1/4
1/3
1/6
1/2
18
A small p-value means:
No relationship
π
Strong evidence against the null hypothesis
π
19
True or False: Sample means always equal the population mean.
True
False
20
What is the null hypothesis usually written as?
π»0βΆπ=value
π€
π€¨
π»0βΆπβ value
21
A 90% confidence interval for students who like Wingstop is (0.70,0.80). What does this mean?
70% to 80% of this sample like Wingstop
π
We are 90% confident the true proportion is between 70% and 80%
90% of students like Wingstop
22
What does a two -tailed test check for?
Less than
Not equal to
Equal to
Greater than
23
Youβre looking at a scatterplot with dots going up from left to right. What kind of relationship is that?
A) A downward frown π
D) A mystery trend π΅οΈ
B) A positive relationship π
C) A scatter mess π΅
24
What does 95% confidence interval for the slope tell us?
The slope is exactly 0
The slope will not change
The Data in perfect
The interval likely contains the true slope
25
Which of these is a continuous random variable?
Height of the tree
How cookies are in a jar
The temperature outside
Number of books on the shelf
26
You measure the speed (in cm/sec) of 5 turtles: 5,5,5,5, and 5
A) 0
B) 5
C) 1
D) Can turtles even go that fast?
27
A cat website says 90% of users prefer cats over dogs π± > πΆ. You think more people like dogs. What are the hypotheses?
A) H0: P=0.90 Ha: P>0.90
D) H0: p > 0.90 Ha: p = 0.90
B) H0: p < 0.90 Ha: p = 0.90
C) H0: P=0.90 Ha: P<0.90
28
True or False Bar Graph is a Quantitative Data?
True
False
29
Which sample size is likely to give the most reliable results?
100 people
25 people
10 people
5 people
30
30 out of 50 like pineapple on pizza. What's the proportion?
0.50
0.60
0.40
0.30
31
What is the probability of drawing a King or a Heart from a standard deck?
C)1/4
D) 17/52
A) 1/13
B)4/13
32
What is the probability of picking an even number from 1 to 5?
3/5
1/5
2/5
4/5
33
What shape is this?
A) Skewed Right
C) Uniform
B) Skewed Left
D) Symmetric
34
What room are you guys in right now?
SS4
M2
M10
M11
35
1 in 5 cookies has chocolate chips. You count how many until the first one. What kind of situation is this?
Uniform distribution
Normal distribution
Binomial distribution
Geometric distribution.
36
A day is picked at random. What is the probability itβs a weekend (Saturday or Sunday)?
1/2
2/7
1/7
5/7
37
50 students picked randomly from all students?
SYSTEMATIC
Convenience
Random Simple
STRATIFIED
38
True or False: As sample size increases, the sampling distribution becomes less spread out.
False
True
39
Which question is most likely to suffer from response bias?
D) βWhatβs your age?β
C) βWhatβs your favorite color?β
B) βHow many pets do you own?β
A) βDo you brush your teeth every day?β
40
The sampling distribution of the slope is centered at:
The sample slope
The y-intercept
The true population slope
π€π€¨π«₯
41
Test scores are normal with a mean of 500, SD 100. What % scored between 400 and 600? π₯³
D) 99.7% π
C) 95% π§
B) 68% π₯³
A) 35%π
42
Which of these is a discrete random variable?
The temperature outside
The time it takes to eat lunch
The length of a piece of string
The number of pets in the home
43
64 out of 80 like dogs. What's the proportion?
π
Eighteen
8
0.80
44
What does correlation of 0 mean?
No correlation
None of this
Negative Correlation
Positive Correlation
45
Which of these is NOT needed to perform a significance test for the mean?
Population mean
Sample size
Sample mean
Sample median
46
What shape is the sampling distribution of the slope if conditions are met?
Uniform
Bimodal
Swewed
Approximately normal
47
If a 90% confidence interval for a proportion is (0.40, 0.60), what does this mean?
We are 90% confident the true proportion is between 0.40 and 0.60.
π΄πͺ
90% of people are in the interval.
π΄πͺ
48
As sample size increases, the spread of the sample means...
Disappears
Decreases
Increases
Stays the same
49
Why do we take a random sample?
To avoid bias and get a fair representation
So it's faster to collect data
Because Random is easier
To get the answers we want
50
when it's hot outside, more people eat ice cream. Why?
Hot weather makes people want cold treats
Who doesn't like ice cream
Ice cream is good
Everyone likes to eat ice cream
51
If X has a mean of 5 and a variance of 2, what is the variance of Y=3X?
18
30
9
6
52
True or False Two-Way Table is a Categorical Data?
False
True
53
What does the symbol for the population mean?
a
p
x
ΞΌ
54
Which of these is needed to build a confidence interval using the t-distribution?
Sample standard deviation
Population size
Population mean
sample variance
55
What is the sampling distribution of the sample mean?
Double the population
The same as the population mean
Half the population mean
Always Zero
56
A confidence interval for proportion is (0.25,0.35). What is the margin of error?
0.30
0.15
0.10
0.05
57
What does a Z score represent in statistics?
The total number of values πΆβπ«
The number of standard deviations a value is from the mean π₯³
The mean of a data set π΄
The square root of the varianceπͺ
58
True or False Histogram is a Quantitative Data?
False
True
59
You have a sample of 10 people. which distribution should you use?
π
Z-distribution
π
t-distribution
60
What is Coach Searl's favorite animal?
Cat
Dog
Lion
Star wars
61
A 95% confidence interval means:
95% of data is inside the interval
We're 95% sure we measured correctly
We are 95% confident the true mean is in our interval
5% of people are wrong
62
What is the probability of flipping heads on a coin?
1/2
1/3
1
0
