If there is an even number of data points, the median is found by...

lining them up in order & averaging the 2 middle numbers

When do we use the z-score table?

to find the proportion or percentage associated with a z-score

how far a single observation is from the mean in standard deviation units

Kurtosis describes...

how pointy, flat or normal a distribution is.

What does a z-score measure?

How far an observation is from the mean in SD units.

We have to square root the variance otherwise

the sum of all the deviations would equal zero

the average distance the observations are away from the mean

the most frequently occurring number

The greater the z-score...

the better a student did on their test

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1003PSY 2018 wks 1 - 4 content

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1003PSY 2018 wks 1-3 content

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Questions 23

Answers

1
If there is an even number of data points, the median is found by...
lining them up in order & averaging the 2 middle numbers
calculating the average
summing all data points and dividing by 2.
lining them up in order & finding the middle number.
2
Box plots can be used to compare more than one variable. True or False?
False
.
True
.
3
When do we use the z-score table?
to find the significance of a z-score
to find out who did best on the exam
to find the proportion or percentage associated with a z-score
to find the degrees of freedom associated with a z-score
4
Which value is resistant to the effect of outliers?
The mean
The standard deviation
The median
The variance
5
A z-score represents
how far observations are from each other in SD units
how far a single observation is from the mean in standard deviation units
how far an observation is from the mean on average
the average distance scores are from the mean
6
Kurtosis describes...
how pointy, flat or normal a distribution is.
how many peaks a distribution has
the tail of a distribution
the name of a bell shaped histogram
7
What is the mean and standard deviation of a normal distribution?
0 and 1
1 and 3
The mean can vary but the standard deviation is always 1.
They both can vary
8
The shape of the data (skew etc) is best determined by looking at...
The picture
The data and picture
The data
The centre and spread
9
Interval and ratio are which types of data?
Categorical
Qualitative
Nominal
Continuous
10
In a negatively skewed histogram, the tail extends out ...?
to the left
in a pointy shape
to the right
in a flat shape
11
What does a z-score measure?
How far an observation is free to vary.
How far observations vary from one another in SD units.
How far an observation is from the mean in SD units.
How different one mean is compared to another mean.
12
The ends of the box in a box-and-whisker plot represent what?
The range
The minimum and maximum
The Q1 and Q3
The range
13
If the mean stays the same but SD increases what happens to the shape of the distribution.
It spreads out.
It becomes leptokurtic.
It remains the same.
It becomes multi-modal.
14
We have to square root the variance otherwise
the number remains standardized
the observations vary too far from the mean
we can't find the 'Sum of Squares'.
the sum of all the deviations would equal zero
15
In a stem-and-leaf-plot, which part of the numbers 2, 33, 444, and 5555 would be the leaf?
0, 3, 44, 555
2, 3, 44, 555
0, 3, 4, 5
2, 3, 4, 5
16
Variance is...
is the same as the Sum of Squares
the square root of the standard deviation
how far away the observations are from each other
the average distance the observations are away from the mean
17
Quartile 2 is the same as the
mode
median
mean
average
18
What is the mean and standard deviation of a standard normal distribution?
The mean can vary but the standard deviation is always 1.
0 and 1
1 and 3
They both can vary
19
Q3 + (1.5)(IQR) is a formula for finding...?
the mean
outliers
the range
the median
20
If the SD increases but the mean stays the same, what happens to the shape of the distribution?
The tails get wider.
The number of peaks increases.
It becomes skewed.
It becomes standardized.
21
Leptokurtic describes a
a pointy distribution
a normal distribution
a bell shaped curve
a flat histogram
22
The mode is...
all the scores summed, then divided by the number of scores
Quartile 3 minus Quartile 1
the most frequently occurring number
the number in the middle, once all the data are in order
23
The greater the z-score...
the better a student did on their test
the worse a student did on their test
the more likely we have made a mistake in our data collection
the more average the student did on their test

1003PSY 2018 wks 1 - 4 content Flashcards | StudBud