In statistics, there is an important measure called the correlation coefficient. It is usually
symbolized with the Greek letter (rho). It is a measure of how one random variable varies with
another random variable. If we have two random variab
Chi-square test for normality of regression errors
The following material is covered in your text on pages 530-534. Note the correspondence of the
table below with the table on page 532 of the text.
Using the errors from an OLS regression estimat
The Parameter of interest describes Lebron career shooting percentage over the life time.
56.5% is a statistic because it summarized 2012 and 2013 average shooting percentage.
The chance model would assign 0.5, which is 5
CI = 0.35+1.96(0.01508)=0.3795
CI = 32.04% to 37.95%
We are 95% of confident the proportion is between 32.04% to 37.95%
The Observation Units is the student is the statistics class
The Variable is th
The long-run proportion of Dwyane making a field goal is a parameter.
52.1% is a statistic because it averages the Miami heat hit in 2012-2013.
When I simulation possible outcome assuming the chance model. I would flip the coin 1093
A: The soap and the people are the observation unit in this study
B: The three variable are peoples gender, location, hand wash or not
C:Are the people wash their hand after used the restroom? If so, which gender has the mo
An Introduction to Statistics and
I. Two Branches of Statistics
A. Describe data
Descriptive Statistics: Organize,
summarize, and communicate a group of
B. Make inferences.
Chapter 2. Frequency Distributions
I. Frequency Distributions
Raw Scores: data that has not been analyzed yet.
Frequency Distribution: describes the pattern of a set of
numbers by displaying a count or proportion for each
possible value of a variable.
o Is a descriptive statistic that best represents the center of a data set
o Three measures:
Mean: Arithmetic average
Median: middle score
Mode: most common score
o Symbols for mean: M & X (with line above it)
o X: refers to s
Central Tendency and Variability
I. Central Tendency
Is a descriptive statistic that best represents the center of a data
Three measures of Central Tendency:
1. Mean: Arithmetic average.
2. Median: Middle score.
3. Mode: Most common score
Homework Assignment Chapter 1
1. The two branches of statistics are _ and _.
a. theoretical statistics; applied statistics
b. research design; data analysis
c. numerical methods; graphical methods
d. descriptive statistics; inferential statistics
Sampling and Probability
Two General Forms of Samples:
Random Samples every member of the population has an
equal chance of being selected.
Random Sampling is ideal but expensive, time-consuming and often
Convenience Samples uses
Raw Scores: Data that has not been analyzed yet
Frequency Distribution: describe the pattern of a set of numbers by displaying a count or
proportion for each possible value of a variable
Frequency Table: Displays counts for each value of one interval var
It was determined based on the data collected that a 2x2 Chi-Square test was the best decision to test the data collected. The main reason behind choosing a Chi-Square is the data was classified as categorical data. And the reason 2x2 was chosen is t