This is Mike.
This is Mikes How to be Evil Class.
Today is the final exam of Evil!
They take the Exam of Evil.
The results are in!
The mean score on the Exam of Evil is 75 and the standard deviation is 5.
Mike got a score of 82. He needs to be in the top
1. What is sampling error? Why is it a problem?
A sampling error occurs when you fail to get a good representative sample of a population. A sampling
error indicates that the numerical value of a sample statistic probably will be an error as a result
Hypothesis Tests Applied to Means: Two Independent Samples
Review of Hypothesis Tests
For Individual Scores
Z score (does not use degrees of freedom)
For a One-Sample Test When Sigma is KNOWN
This formula is testing a sample mean. So we must now base the
Homework 1 10 points
1. 2.1 Give one example each of a nominal, ordinal, interval and ratio measure.
Nominal- Categories such as gender or handedness.
Ordinal- Order or rankings, such as finishers in a race.
Interval- Differences between intervals with no
Consider the speed of light as measured by bouncing a laser beam off the surface of the moon
and recording the time it took to bounce back.
The 2 Distribution is unlike the normal distributions which is symmetric, the 2-distribution is
skewed to the right.
The 2-distribution consists of a whole family of distributions distinguished by a single whole
number parameter, , called t
Review One-Sample T test
Sampling distributions- all possible means of a population means vary because of sampling
The area under the curve shows likelihood of a N.
Null hypothesis is true. Ho: M1=M2
Conference interval 95%
The Normal Distribution
Consider the following data set.
Enter the Normal Curve
1. The mean, median and mode are equal.
2. The distri
Hypothesis Tests Applied to Means: One Sample
Central Limit Theorem
Sampling Distribution of the
Testing Hypotheses about Means When is Known
Testing an individual score
Testing a sample mean
Chapter 11 Multiple Regression
Consider the following regression analysis predicting infant mortality rate as a function of
Fertility rate per
Chapter 5 Measures of Variability
Dispersion (Variability): The degree to which individual data points are distributed
around the mean.
Measures of Variability
Range- difference b/n the lowest and highest in a distribution.
Interquartile Range- from the 2
95% (You can correct the wrong answers to get credit back)
1. What is the difference between a population and a sample?
A population includes all members of a defined group that is being studied. A sample is a scientifically