Measures of Central Tendency
Measures of Variability
Tables and Graphs
Properties of distributions
Data and Sampling
100
What is the mode of the following numbers:
18, 42, 29, 36, 50, 29, 32
29
100
This is calculated by subtracting the lowest score from the highest score.
The range
100
The number of scores in a particular interval.
What is the frequency?
100
These kinds of distributions are non-symmetric.
What is skewed?
100
Honda, Ford, Mazda, GM, Nissan. What type of variable are these?
Categorical
200
What is the median of the following numbers:
5, 2, 43, 1, 48, 40, 45
40
200
What measure of variability calculates the middle 50% of scores?
The Interquartile Range (IQR)
200
The number of scores in a particular interval and all the intervals lower than it.
What is the cumulative frequency?
200
This type of distribution has two "humps."
What is bimodal?
200
"Distance in meters" is what type of variable?
Quantitative continuous
300
What is the mean of the following numbers:
10, 10, 25, 25, 30
20
300
This is a measure of variability that corresponds to the average amount that scores in a sample deviate from the mean.
What is the standard deviation?
300
A graph where bars represent the number of scores per interval.
Histogram
300
If Tatiana scored 80 on an exam where the mean was 50 and the standard deviation was 15, what is her z-score?
2
300
This sampling method ensures every individual in the population has an equal chance of being selected, often using random number generators or drawing names from a hat.
Simple random sampling
400
_____ % of the data falls above and _____ % of the data falls below the median.
50%
400
You calculate this measure of variability by squaring the standard deviation.
What is the variance.
400
Besides minimum and maximum, what 3 other values do you need to draw a boxplot?
Q1, Q2, Q3
400
This is the percentage of scores that fall within plus or minus 2 standard deviations of the mean.
95%
400
A researcher divides a city into neighborhoods and randomly selects five neighborhoods to survey every household within them. This is an example of this sampling method.
Cluster sampling
500
Which measure of central tendency is most affected by outliers?
Mean
500
What is one mathematical way to find outliers?
Q1 - 1.5*IQR, Q3 + 1.5*IQR
or
+/- 2 standard deviations
500
In the following boxplot, what percentage of data falls between 10 and 19?
75%
500
What percentage of data falls within 3 standard deviations on a normal distribution?
99.7%
500
In this sampling technique, the population is divided into distinct subgroups, and a random sample is taken from each subgroup to ensure representation.
Stratified sampling