Statistical Calculator Cheat Sheet, Cheat Sheet of Statistics

Download Statistical Calculator Cheat Sheet and more Cheat Sheet Statistics in PDF only on Docsity! TI-83, 84 Calculator Instructions for Statistics: 1. Entering Data Data points are stored in Lists on the TI-83/84. If you haven't used the calculator before, you may want to get rid of everything that was there. You do this by pressing 2nd [MEM] (above the + sign), select [4:ClrAllLists] and press ENTER twice. Then press STAT and highlight [5:SetUpEditor] and press ENTER twice. You will not have to do this every time that you want to enter a list, but it's a good idea to do it every once in a while. Press STAT, select [EDIT... ] this puts you into the List Editor. You will see columns with L1, L2,... going across the top. You can store 6 different sets of data here. Now enter the data pressing ENTER after each data point. After the last data point press ENTER then QUIT. The data is now stored in L1. You can store data in any of the other lists by scrolling across in the list editor. Sorting Data Once data has been entered into a list, you can rearrange the list into ascending or descending order. To sort L1 in ascending order, press STAT, select [2:SortA(], [2nd] [L1], (above the number 1). Now if you go back into the list editor, the list has been sorted. To sort in descending order, use the [3:SortD(] function. 2. How to find the mean, standard deviation, and the five-number summary of a data set: • First enter your data set into one of the lists: STAT
EDIT
1: Edit… This menu takes you to the lists. If you want to delete the numbers in one of your lists, for example in L1, go up with your arrow and highlight L1. Then press CLEAR and ENTER. So enter your data list into one of your lists. • To find the statistics: STAT
CALC
1: 1-Var Stats In your window you should see 1-Var Stats Now your calculator waits for you to tell where your list is. So if your data set is in L1, enter L1 (2 nd key 1). Push ENTER. • You should see the following statistics: o x mean o x∑ the sum of the data o x 2∑ the sum of the squared data o Sx standard deviation of the sample o σx standard deviation of the population o n sample size o minX the minimum of the data set o Q1 first quartile o Med median o Q3 third quartile o maxX the maximum of the data set 3. How to find the correlation coefficient (r), the coefficient of determination (r 2 ), the slope of the least squares regression line (b), and the y-intercept (a). • First you need to enter the values of the explanatory variable into one list, say L1, and the values of the response variable into another list, say L2. STAT
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1: Edit… This menu takes you to the lists. If you want to delete the numbers in one of your lists, for example in L1, go up with your arrow and highlight L1. Then press CLEAR and ENTER. So enter your data lists into two lists. • STAT
CALC
8:LinReg(a+bx) In your window you should see LinReg(a+bx). Your calculator waits for you to tell where your lists are. So you need to enter L1 (2 nd key 1), then a comma (above 7), and L2 (2 nd key 2). So you should see: LinReg(a+bx) L1,L2 Push ENTER. • You should see: o LinReg o y=a+bx o a the y-intercept o b the slope o r2 coefficient of determination o r correlation coefficient (If your TI-83 does not give you the correlation coefficient, r, press 2ND 0 (CATALOG) and select DiagnosticOn. Press Enter twice so you should see “Done” in the window. Repeat the calculation.) 4. How to find probabilities for a Normal distribution, and how to find a z-score from a given probability a. To find probabilities after you figured out z: use DISTR (2 nd VARS)
2: normalcdf( The inputs are normalcdf(lower bound, upper bound) So in your window you should see normalcdf( • If you need a lower tail: normalcdf(-9999999,z) • If you need an upper tail: normalcdf(z,9999999) • If you need a between part: normalcdf(z1,z2) } The 5-number summary