![]() It is the second option in the DISTR menu, normalcdf. It will also save you standardising to a normal distribution. of 16ħ Normal Distribution Again, your calculator will save you searching through books of tables. `vaa20,1/6)=` 1eSe This is exactly the same as the list in your book of tables. As before, if you don t put in the 3, you will get all the cumulative probabilities which you can store in a list. Notice we ve entered 20, 1 6,3 in the brackets, because we wanted 3 successes. `vaa20,1/6,3) e Apart from that it is exactly as before. We need the cumulative binomial distribution, which is B:binomcdf in the list of distributions. Suppose you had to work this out Find the probability of getting 3 sixes or less when you throw a die 20 times. WARNING the values for minx, maxx, the median and quartiles are not valid when you do this!!! of 16Ħ Binomial cumulative distribution function Rather than using the book of tables, you could use your calculator. `S>8`1,`2)e Grouped Data For grouped data, you will need to enter the mid-interval values in the first list, then proceed as above. You just need to tell it which list holds the frequencies again. You could also use the LIST menu, particularly if you require the variance. Then choose 1-Var Stats again, but this time you need to say where the frequencies are, so enter L2 after the L1, separated by a comma. Don t forget to quit back to the main screen. Se Enter the variables in one list, say L1, and the frequencies in the next list, say L2. x f Entering the data It s easiest to use the Stat List Editor. For example, suppose you wanted to calculate statistics for the data shown in the table. Σx Σx² Sx σx n minx Q₁ Med Q₃ maxx mean sum sum of the squares sample standard deviation population standard deviation number of items of data minimum value lower quartile median upper quartile maximum value of 16Ĥ Data in Frequency Tables If your data is presented in a frequency table, this is no problem. Use the cursor keys to move down the list. ![]() You are now shown just about everything you might need. S>e`1e Tell the calculator which list your data is in you don t need brackets this time. ![]() You are calculating statistics of one variable, so choose 1-Var Stats. 1-Var Stats In the STAT menu, choose CALC. Note this calculates the sample standard deviation and variance. Then tell the calculator which list your data is stored in. `S>7`1)e Choose which statistic you require, either by using the cursor keys or choosing its number. 3 Using the LIST menu Go to the LIST menu, then choose the MATH menu.
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