Unit 2 Review Spring 2017
1. A set of test scores are normally distributed. Their mean is 100 and standard deviation is 20. These
scores are converted to standard normal z scores. What would be the mean and median of this
Chapter 7 Practice keys
1. Explain the difference between a parameter and a statistic.
2. Two symbols are used for the mean: and
a. Which represents a parameter and which a statistic?
b. In determining the mean age of all students at your school, you sur
Doug Jones / Thu.02.24.11
So you want to calculate a z-score on your TI-83/84!
OK, lets say youve got a data set - for purposes of illustration, lets enter cfw_1, 12, 33, 9, 18, 5 into
Now I hope that you will recall the formula for a z-score:
Lets get ready to SCATTERPLOT and INTERPRET.
Ill be using a TI-83 calculator, but all the steps should be about the same on a TI-84.
There are several aspects to this process, but if it seems complicated to you then (1) if you d
Doug Jones / Sun.02.27.11
So you want to generate a sequence of Pseudo Random Numbers on your TI-83/84!
Lets say that youve got 50 people in your neighborhood, and you want to draw a simple random
sample of eight of your n
PAINLESS CONFIDENCE INTERVALS for POPULATION PROPORTIONS
d. jones / 20110410sun
In class, we talked about the almost-longhand method (that is using your graphing calculator somewhat)
of determining a 95% CI (Confidence Interval) for a population proportio