2.1 Scales of Measurement
Measurement assigning numbers to objects
o We measure certain characteristics, which are often categorized using S.S.
Steves Measurement Scales
Nominal numbers are used to distinguish different groups
Measures of Variability
Measures of Central Tendency (mean, median, mode) dont give a complete picture
about the data
o Does not tell us how much the data varies
o Measures of dispersion: tell us how much data varies around the mean,
Measures of Central Tendency
Numerical value that refers to the center of the distribution
The most common score
o How to calculate the mode if two adjacent values have the same and highest
Chapter 7 Basics Concepts of Probability
Analytic view: definition of probability in terms of an analysis of possible outcomes.
o If there are 10 candies and 4 of those are caramels, there is a probability of .4
to draw a caramel at random.
Chapter 8 Review
1. What is a sampling distribution?
- The distribution of statistics over repeated sampling.
2. What is sampling error?
- The variability of sample estimates of some statistic such as mean.
3. What is the standard error of mean?
- The sta
1. A teacher wants to assess the impact of praise on childrens ability to solve math problems. He
considers three different praise conditions praise, silence and criticism). Also, he wants to know
if it makes a difference if children solve easy or difficu
1. You are assessing the work posture of surgeons in two different surgical environments. Work
posture is rated along three categories (low risk of developing skeletomuscular problems,
moderate risk for developing skeletomuscular problems and
The ANOVA is a statistical method that stands for analysis of variance, a between subject
one way ANOVA is used when a researcher wants to compare more than three groups. In order to
be able to do that there must be an assumption of normal dist
Marie is getting married tomorrow at an outdoor ceremony in the desert. In recent years, it has
rained only 5 days each year. Unfortunately, the weatherman has predicted rain for tomorrow.
When it actually rains, the weatherman correctly f