Frequency Distributions TI30 XS Instructions Symbols Finding measures

Frequency Distributions TI-30 XS Instructions

Symbols

Finding measures of central tendency and dispersion using the calculator Given the following data: 27, 38, 49, 56, 65, 74, 83, 92 Find the following: › › Mean Median Standard deviation Min, max, Q 1, and Q 3, and IQR Mean = Median = Standard Deviation = Min = Max = Q 1 = Q 3 = IQR =

How do we do that? (27, 38, 49, 56, 65, 74, 83, 92 In L 1, list all of your data Hit 2 nd and stat Highlight STATS 1: 1 Var Stats and ENTER DATA – L 1 highlighted FRG – ONE highlighted CALC

Clearing Your Lists You’ll hit DATA twice. As you experiment with it, you’ll get comfortable with going back and forth from clearing the data to your lists.

Frequencies and the TI 30 XS Grades Frequency 88 4 94 8 83 7 96 5 Move cursor to L 1 Enter the grades Move cursor to L 2 Enter the frequencies Hit 2 ND, STAT Highlight 1: 1 -Var Stats ENTER DATA: Highlight L 1 and FRG: L 2 Calc

What Does it All Mean? Find the mean – Find the sample standard deviation Find the population standard deviation Find the sum of all the values Find the min, max, Q 1 and Q 3 values Find the median

TI-30 XS Calculators Hit DATA Find the “midpoint” of each interval (6, 11, 16, 21) To find the midpoint, add the two given points and divide by two. Ex: 4+8 = 12; 12/2=6; 6 is your midpoint. In L 1 enter the four midpoints Move cursor to L 2 Enter the frequencies (8, 3, 10, 5) Hit 2 ND, STAT Highlight 1: 1 -Var Stats ENTER DATA: Highlight L 1 and FRG: L 2

You Try It Find: a) Mean b) Median c) Mode d) Min, Max, Q 1, Q 3 e) Standard Deviation