Example 2-SampZTest AP Stats Comparing Two Means Using Stats Functions TI-84

1. Comparing Two Means
Using the
TI-84
Created by Donna Wiles

2. THINGS TO REMEMBER
• Using the graphing calculator is required to
perform well in class and on the AP Stats
exam. It is practically impossible to complete
work in the time allowed without an excellent
working knowledge of the stats functions.

3. THINGS YOUR CALCULATOR
DOESN’T KNOW
• What’s your plan to solve the problem?
• What’s the null and alternative hypotheses?
• Have conditions been met?
• Which test you should use.
• What values you should use.
• How to interpret the results.

4. THE THING YOUR CALCULATOR
DOES
YOUR CALCULATOR
CALCULATES COMPLEX
FORMULAS SO MUCH FASTER
AND BETTER THAN YOU DO
GIVING YOU TIME TO THINK
ABOUT ALL THE THING IT
DOESN’T DO.

5. MODULE 11 LESSON 2
TEACHER ADDED NOTES
Testing When the SD of Both Samples is Known
Example

6. Testing When the SD of Both Samples
is Known Example continued
Of course you can work
everything out by hand and this
is shown in the course lesson
notes, but why not use the
calculator. Just be sure to show
your work by:
1. Name the test used
2. Clearly label every value used
in calculating the values.
3. Report all output values
Try the 2-SampZTest on your
calc, then see the next slide for
calculator shots!
Something is missing in this
response. In addition to
checking the 10% condition,
REMEMBER to include a second
part to the independence check
when comparing two samples.
You must make a statement
and it must be reasonable to
believe the samples do not
have any effect on each other!

7. CALCULATOR SHOTS

8. NOT FINISHED UNTIL YOU MAKE A
DECISION AND AN INTERPRET THAT
DECISION.