Summation
Research Methods
Frequency Distributions
Measures of Central Tendency
Statistical Terms
100
Data set: 5 2 8 6
∑x =____
What is 21?
100
Outcome that researchers measure in an experiment, often affected by the independent variable
What is the Dependent Variable?
100
Largest Value - Smallest Value
This formula is for
What is Range?
100
Variable that is manipulated in a study/experiment (cause)
What is Independent Variable?
100
The entire set of the individuals of interest for a particular research question
What is Population?
200
Data set: 8 2 6 5
(∑x)2 =____
What is 144?
200
Representative portion from a larger group. Term that describes this smaller group.
What is a Sample?
200
This type of graph is called:
What is a Histogram?
200
When there are two modes.
What is Bimodal?
200
The most frequently occurring value in a data set
What is Mode?
300
X f
10 1
9 2
8 4
7 3
6 2
∑(X – 1) = _________
What is 81?
300
Four things statistics are used for
What is:
- To organize
- To describe
- To interpret data
- To understand & conduct research
300
Formula used to calculate the interval size (width) of a frequency distribution
What is (Range / # of Class Intervals)?
300
Sum of squared deviations formula that is best used for decimals instead of whole numbers.
What is the Computational Formula?
SS = ∑x2 - (∑x)2/n
300
A sampling method where each member of the population has an equal chance of being selected.
What is Random Sampling?
400
Find each value requested for the distribution of scores in the following table.
X f
5 2
4 3
3 1
2 4
1 2
n = _________ and ∑X =________
What is n = 35 and ∑x = 12?
400
Methods that use sample data to make general statements about a population
What is Inferential Statistics?
400
This type of distribution is called:
What is Negatively Skewed?
400
Changing the value of a score in a distribution always changes the mean (This is a true or false question).
What is True?
400
A measure that describes the spread or dispersion of a set of data points
What is Variance?
500
Data Set: 2 6 8 5
∑(x-2)2 =_____
What is 61?
500
Research method that involves manipulating an independent variable to observe the effect on a dependent variable
What is an Experimental Study?
500
There are 42 first-year students who get less than 6 hours of sleep, while there are 38 first-years who get 6 or more hours of sleep. There are 25 second-year students who get less than 6 hours of sleep, while there are 45 second-year students who get 6 or more hours of sleep. What is the approximate percentage of students reported getting less than 6 hours a sleep on average?
What is 45% of the students?
500
This measure of central tendency is best for ordinal data.
What is median?
500
1. It describes a set of operations for measuring the construct
2. It defines the construct in terms of the resulting measurements
What are Operational Definitions?