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Central tendency and dispersion review Flashcards | StudBud
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Central tendency and dispersion review
Central tendency and dispersion review
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1
Is this graph skewed to the left or right?
Skewed to the left
Skewed to the right
2
Is the data skewed to the left or the right?
flat
right
neither
left
3
Correlation vs Causation?
Causation implies Correlation
Causation means the same thing as Correlation
Causation DOES NOT equal Correlation
No Idea!
4
Which of the following is NOT a common measure of central tendency?
mode
median
frequency
mean
5
What is the upper quartile of this data set?
17
20
23
21
6
Find the range of this box plot.
9
0
5
3
7
Which brand's distribution is most positively(right) skewed?
A
C
B
It cannot be determined
8
Which data point is part of Quartile three?
16
21
23
19
9
Which measure of central tendency should be used?
Median
Mode
Mean
10
What is variance in statistics?
The value that appears most frequently in the set
Its a measure of how much the values in a dataset differ from the mean.
The average of the numbers
The middle value of a sorted list of numbers
11
True or False.
This graph is skewed left.
False
True
12
Determine the lower quartile of this data set.
17
26
23
20
13
A and B are independent events. P(
A
') = 0.6 and P(
B
) = 0.3 Find P(
A
∩
B
).
0.9
0.12
0.7
0.18
14
What are the measures of variance in descriptive statistics?
Mean, median, and mode
Standard deviation, range, and variance
Rate and ratio
Grams and kilograms
15
If the data is skewed right...
The mean is to the left of the median
The mean is to the right of the median
16
Is this a right skew?
False
True
17
Descriptive statistic & measure of central tendency; exact halfway point of data distribution
Correlation coefficient
Mean
Median
Mode
18
Calculate the standard deviation of 5,7,12,21,22
9.02
7.00
8.45
8.23
19
When using "OR" you add the probabilities.
Always True
True if they are disjoint
Never True
20
Which measure of central tendency should be used?
Median
Mean
Mode
21
Why are pie charts useful?
Easy to interpret
Shows proportions of the total
22
What is standard deviation?
measure of how much score vary around the mean of a data set
the likelihood that your results will occur by chance alone
the difference between highest and lowest number in a set
the most frequently occurring number in a data set
23
Why do we use box plots?
To find the medians of all data
To make a box with whiskers.
To find the mean of the data.
To see the a range of data and it's distribution.
24
What is the probability of a product less than 15?
P(Product less than 15) = 14/17
P(Product less than 15) = 14/18
P(Product less than 15) = 13/17
P(Product less than 15) = 13/18
25
What is the first quartile in this data set? 5, 9, 11, 17, 21, 33, 35
10
9.5
9
11
26
Which of these is a positive or right skewed curve
Right
Left
27
Is this a left skew?
False
True
28
Find the compound probability of rolling a 3, and then an even number?
1/2
1/12
1/8
1/6
29
If the data is skewed left...
The mean is to the right of the median
The mean is to the left of the median
30
What is the compound probability of rolling a die (landing on 6) and flipping a coin (heads)?
1/6
1/4
1/12
2/12
31
Data points in the first quartile are between which two points?
12 and 15
8 and 12
6 and 8
15 and 19
32
In statistics, spread of dispersion is described by:
Mode
Standard deviation
Mean
Median
33
Standard deviation is a measure of:
bad behaviour
the outliers
the spread
the centre
34
The spread or dispersion of data, including the extent to which scores vary from the mean
Central tendency
Statistical significance
Standard deviation
Variability
35
How are variance and standard deviation related?
standard deviation = √variance
variance = √standard deviation
variance2 = standard deviation2
standard deviation = variance2
