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Statistics review
Statistics review
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#grade_12 #math #appliedmathandstatistics
Flashcards
20 cards
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Questions
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Answers
1
An event is a subset of the sample space. It may consist of one or more outcomes .
False
True
2
What is midpoint?
The sum of the lower and upper limits of the class divided by two.
A midpoint is a point that divides a line segment into two equal haves.
A midpoint is defined within the context of a line segment.
3
Data always provide a clear and unbiased picture of a situation.
True
False
4
In a normal distribution what percentage of data falls within 1 standard deviation of the mean?
Approximately 35%
Approximately 68%
Approximately 75%
Approximately 34%
5
What is mode ?
A dataset must have a mode
The value that appears most frequently in a dataset?
The mode is the frequency not the value
The mode is always the average of the data
6
What is a normal distribution?
Normal distribution is only applicable to continuous data
A bell-shaped curve where most data falls near the mean
Normal distribution is always the best choice
All data must be normally distributed
7
What is the variance of the dataset : 2,4,4,4,5,5,7,9?
6
4
10
9
8
Find the standard deviation for the same dataset: 2,4,4,4,5,5,7,9?
9
5
7
2
9
An outlier is a value significantly higher or lower than most of the data
False
True
10
A variable is continuous when it has an uncountable number represented by interval on a number line
True
False
11
Find the range of the dataset: 15,22,13,9,18.
11
13
12
15
12
Median is the middle value when the data is arranged in order
False
True
13
How to calculate relative frequency?
FxN
F/N
Class frequency(f)\sample size(n)
N/F
14
They are two type of variance: discrete and continuous.
False
True
15
What is sample ?
Any random method is a good sample
A sample is always perfectly representative of the population
A subject of the population used to represent the whole group
A sample must be the same size as the population
16
Define variance ?
Variance is always positive
Variance is a measure of ventral tendency
Variance is the same as standard deviation
The average squared difference between each data point and the mean
17
A dice is rolled what is probability of rolling a 4?
2/6
1/9
3/9
1/6
18
What is population in statistics?
The entire group being studied in a research project
Population data is always perfect and accurate
A population always refer to people
A sample is always a perfect representation of the population
19
What is standard deviation?
A measure of the spread of data around the mean
A measure of the central tendency of a dataset
A larger standard deviation always indicates a higher average value
The average distance from the mean
20
Probability is the like hood of an event occurring expressed as a ratio or percentage
False
True
