Standard Deviation on TI-84

Standard Deviation on TI-84

You will learn how to calculate standard deviation for a data set.

These are scores on a recent calculus test. Write the data set down

• 45, 28, 56, 100, 94, 88, 93, 100, 78

Enter the data

1. Push "Stat"

2. Choose "1: Edit..."

3. Hit "Enter"

4. Type your data into L1

Multiple Choice

What button do you push first to enter your data?

• Enter

• Stat

• Math

• Mode

Calculate

1. Push "Stat"

2. Arrow right until "CALC" is highlighted

3. Choose "1: 1-Var Stats"

4. Hit "enter"

Multiple Choice

What should you choose once you get to the "CALC" menu?

• Stat

• Med-Med

• Quad Reg

• 1-Var Stats

Multiple Choice

Because the Standard Deviation is almost 25 points, which is a big number...

• You can tell that the Mean is a big number.

• You know that the Median is close to the Mean.

• You know that the data are very spread out.

• You know that the data are very close to the mean.

Multiple Choice

What is the mean and standard deviation?

0, 12, 6, 11, 10

• Mean 7.8, standard deviation 5

• Mean 7.8, standard deviation 4.9

• Mean 39, standard deviation 4.4

• Mean 7.8, standard deviation 4.4

Multiple Choice

If the mean is 112.2 and the standard deviation is 1.7, which statement is true?

• The data vary by less than 2 points from the mean.

• The scores are mostly less than 100

• The data are very spread out and are all higher than 112

Multiple Choice

If the mean is 112.2 and the standard deviation is 1.7, which statement is true?

• 68% of the data are between 110.5 and 113.9

• 95% of the data are between 110.5 and 113.9

• 99.7% of the data are betweeen 110.5 and 113.9

• 25% of the data are between 110.5 and 113.9

Multiple Select

If the mean is 0.3 and the standard deviation is 0.16, what can you say about the data? (Check all that apply)

• The data are very spread out.

• The data are very close to the mean.

• 95% of the data are between 0.16 and 0.3

• 68% fo the data are between 0.14 and 0.46

Multiple Choice

What does the standard deviation tell you?

• How spread out the data are from the mean.

• How big the average value is.

• How many values you have in your data set.

• How many values are above 100.