TI-84 Graphing Calculator Examples

[Pages:3]MAT 156: Statistics

Handout

TI-84 Graphing Calculator Examples

***LU5*** Using the Graphing Calculator for a Poisson: Assume that the Poisson distribution applies and the mean number of aircraft accidents in the U.S. is 8.5 per month. Find the probability that in a month there will be no aircraft accidents. Use poissonpdf (Note: for a single point) or poissoncdf (Note: for a point or less...it's cumulative)

Note: The newer TI-84 Plus Graphing Calculators will ask for is the mean of a Poisson, the text refers to the mean as ?

1. 2nd 2. VARS (3rd row, 4th button) this represents "distr" (distribution)

3. scroll down to poissonpdf ("pdf" is for a single point)

4. Hit enter

5. = 8.5 Scroll down x = 0 Scroll down to Paste

6. Hit enter twice

Note: The older TI-84 Plus Graphing Calculator will NOT prompt you. You must have your command in the form poissonpdf (?,x) For this example: poissonpdf(8.5,0) Answer: .000203 Note: the calculator has 2.03468369E-4 This is scientific notation and states that you must start at the decimal point and move four places to the left. Hence, the answer .000203 Using the above information, find the probability that the number of aircraft accidents in the U.S. is 5 or less.

1. 2nd 2. VARS 3. poissoncdf ("cdf" is cumulative...that point or less)

4. Hit enter

5. = 8.5 Scroll down x = 5 Scroll down to Paste

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MAT 156: Statistics

Handout

6. Hit enter twice

Note: The older TI-84 Plus Graphing Calculator will NOT prompt you. You must have your command in the form poissoncdf (?,x) For this example: poissoncdf(8.5,5)

Answer: .1496

Using the Graphing Calculator for a Binomial: Assume that random guesses are made for ten multiple-choice questions (each question has 5 choices for answers) on an ACT test, so n = 10 trials, P(correct answer) = 1/5 = .2 Find the probability of getting exactly 4 questions correct. So: n = 10 p = .2 X = 4

1. 2nd 2. VARS (3rd row, 4th button) this represents "distr" (distribution) 3. scroll down to binompdf ("pdf" is for a single point)

4. Hit enter

5. trials: 10 Scroll down p: .2 Scroll down X value: 4 Scroll down to Paste 6. Hit enter twice

Note: The older TI-84 Plus Graphing Calculator will NOT prompt you. You must have your command in the form binompdf(n,p,x) For this example: binompdf(10,.2,4) Answer: .0881 Use the above information, find the probability of getting at most 4 questions correct. ("At most 4" means "4 or less")

1. 2nd 2. VARS 3. binomcdf ("cdf" is cumulative...that point or less) 4. Hit enter

5. trials: 10 Scroll down p: .2 Scroll down X value: 4 Scroll down to Paste

6. Hit enter twice

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MAT 156: Statistics

Handout

Note: The older TI-84 Plus Graphing Calculator will NOT prompt you. You must have your command in the form binomcdf(n,p,x) For this example: binomcdf(10,.2,4)

Answer: .9672

? Camilla Walker and Indian Hills Community College

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