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Chance and data practice
Chance and data practice
30 terms
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StudBud Administration
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To help revise for the Chance and Data exam (91037)
Flashcards
30 cards
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Practice quiz
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Questions
30
Answers
1
What does "relative frequency" mean?
theoretical probability
a probability obtained only with a large number of trials
the number of times something happens
experimental probability
2
Should you change a probability written as a fraction into a simpler fraction or a decimal?
Never
Always
Only if you need to compare it with another probability
It doesn't matter
3
What's the probability of drawing a diamond from a pack of cards (without jokers)?
None of the above
25%
1/52
10/52
4
What is the probability that a student randomly selected from this class can ride a bike?
14/30
16/30
11/30
19/30
5
How should you write a probability?
Ratio
Whole number
Decimal, fraction or percentage
Square root
6
What is the probability that a girl from this class can't ride a bike?
9/19
14/30
19/30
10/19
7
What is the range of these numbers? 10, 20, 10, 8
10
11
There isn't one
12
8
What statistics do you need to draw a boxplot?
Mean, minimum, maximum, lower quartile and upper quartile
Mean, median, mode, range and IQR
Mean, median, range, maximum and minimum
Minimum, maximum, lower quartile, upper quartile and median
9
What is the probability of a 'false negative'?
0.00001
0.9490
0.00099
0.04995
10
How would you best describe this outlier?
A liar
Someone who did very little study for the mark they got
Someone with an unusually low mark for the study they did
A mistake
11
This picture is an example of ...
the experimental probability of a coin toss
a probability experiment
long run relative frequency
all of the above
12
What is the median of these numbers? 10, 20, 10, 8
10
There isn't one
12
11
13
What inference can you make about the age of oscar winners from the sample results shown?
We can conclude that the actors are older than the actresses
We can conclude that the actors are likely to be older
We cannot conclude that the actors are older
14
An event that has a probability of 0.9 could be best described as ...
almost certain
probable
equally likely
unlikely
15
Choose the best description of the seasonal cycle
Visitors to Abel Tasman National Park are highest in January
It is getting bigger each year
The seasonal cycle repeats each year
Visitor numbers decrease then increase each year
16
What is the probability of choosing a blue marble from bag A?
3/7
4/7
3/8
4/8
17
What is the probability of getting 2 marbles of the same colour?
4/9
1/9
5/9
2/9
18
What is the probability that a student from this class is a boy who can't ride a bike?
10/30
7/30
9/30
4/30
19
Describe the shape of the distribution of volcano eruption times
Irregular
Normal
Bimodal
Rectangular
20
What is the mode of these numbers? 10, 20, 10, 8
12
10
There isn't one
11
21
If P(blue eyes) = 17%, how many people out of 1000 would you expect to have blue eyes?
17
170
1700
1.7
22
What are the 2 types of probability?
Poisson and normal
deterministic and binomial
experimental and theoretical
true and probabilistic
23
How would you describe the strength of the relationship between grip strength and arm strength?
Weak
There's no relationship between grip strength & arm strength
Moderate
Strong
24
How would you interpret this relationship?
It is negative
As temperature increases, sales decrease.
As temperature increases, sales increase.
For every 1°C increase in temperature, sales decrease by $30
25
What is the mean of these numbers? 10, 20, 10, 8
There isn't one
12
10
11
26
Describe the overall or long term trend of this graph
There is a repeating pattern each year
Abel Tasman visitor numbers are increasing
Visitors to Abel Tasman National Park peak in January
It is decreasing
27
What is the probability that a randomly selected person from this group prefers dictionaries?
5%
5/100
5/135
Nobody prefers to read dictionaries
28
What is the minimum size for a sample in a statistical investigation?
20
15
10
30
29
What is the probability that a family with 2 children has 2 girls?
1/8
1/2 + 1/2
1/2
1/4
30
Which of the following statements is true in regards to "bias"?
Some items in a population are more likely to be selected
Choosing items for a sample randomly will avoid bias
The sample is less likely to 'represent' the population
All of the above
