Introduction
The process of collecting, analyzing, and presenting data.
What is statistics?
This type of graph is only appropriate for nominal or ordinal data.
What is a bar graph?
Some refer to this measure as the ‘middle number’
What is the median?
We can expect this when all the scores in a distribution are the same.
What is no variance?
6, 12, 9
M = 9
The degree to which scores differ in a data set.
What is the variance?
This type of graph is used to display frequencies with the bars touching.
What is a histogram?
The most frequently occurring number(s) in a data set.
MAX – MIN
What is the formula for range?
5, 2, 12, 28
M = 11.75
This is another name for numerical data on an interval or ratio scale.
What is quantitative data?
This type of graph is used to display data in a correlation.
What is a scatterplot?
An outlier can have a huge effect on this measure.
What is the mean?
Q3 - Q1
4, 19, 24, 13, 10
M = 14
The observed value is greater than the critical value, so this is the decision.
What is rejecting the null hypothesis?
This is created when straight lines connect the frequency of each score, which is indicated by dots drawn at the score or the midpoint of the score interval.
These techniques are often used to summarize, organize, and simplify data for this type of statistics.
What are descriptive statistics?
Approximately 95% of the population falls within this range.
7, 13, 1, 15, 21, 33
M = 15
This type of statistics allows researchers to study samples and then make generalizations about the population from which they were selected.
What is inferential statistics?
**Daily Double** The frequency distribution for these data: 3, 3, 4, 5, 4, 0, 2, 3, 1, 0, 5, 1
f X
5 2
4 2
3 3
2 1
1 2
0 2
It is determined by first sorting the data set from lowest to highest and then finding the data point in the middle.
What is the median?
**Daily Double Doubled** Find the standard deviation of this sample: 6, 6, 8, 10
s = 1.92
16, 23, 41, 23, 8, 37, 6
M = 22