Finding p-values - P-values with the Ti83/Ti84 Note: The...

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P-values with the Ti83/Ti84 Note : The majority of the commands used in this handout can be found under the DISTR menu which you can access by pressing [2 nd ] [VARS]. You should see the following: NOTE : The calculator does not have a key for infinity ( ). In some cases when finding a p-value we need to use infinity as a lower or upper bound. Because the calculator does not have such a key we must use a number that acts as infinity. Usually it will be a number that would be “off the chart” if we were to use one of the tables. Please note this in the following examples. Z-table p-values: use choice 2: normalcdf( 1. NOTE: Recall for the standard normal table (the z-table) the z-scores on the table are between –3.59 and 3.59. In essence for this table a z-score of 10 is off the charts, we could use 10 to “act like” infinity. a. Left-tailed test (H1: µ < some number). The p-value would be the area to the left of the test statistic. Let our test statistics be z = -2.01. The p-value would be P(z <-2.01) or the area under the standard normal curve to the left of z = -2.01. Notice that the p-value is .0222. We can find this value using the Normalcdf feature of the calculator found by pressing [2 nd ] [VARS] as noted above.
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The calculator will expect the following: Normalcdf(lowerbound, upperbound). Try typing in: Normalcdf(-10, -2.01) , after pressing [ENTER] you should get the same p-value as above.
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This note was uploaded on 04/17/2011 for the course STATISTICS 2103 taught by Professor Zhao during the Spring '11 term at Temple.

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Finding p-values - P-values with the Ti83/Ti84 Note: The...

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