I need to know how to find the probability that z0 is greater than or equal to 2.40 using my TI-83+. The answer is .008200, but I don't know how to get that using my calculator. The only reason I know the answer is because it is an example from my homework. Please help! On a side note, this is for a test so I need to know how to do it on my calculator, I know there is a chart in the back of my book that I can use, but I can't use my book on my test. Thanks.
To find the probability that z0 is greater than or equal to 2.40 using your TI-83+, you can use the normal cumulative distribution function (cdf) function. Here's how you can do it step by step on your calculator:
1. Turn on your calculator and make sure you are in the "NORMAL" menu. To access it, press the "2nd" key, and then press "VARS" (DISTR). This should bring up the DISTR menu.
2. In the DISTR menu, scroll down or press the number key that corresponds to "2: normalcdf(" to select the normal cumulative distribution function.
3. You will see the syntax: normalcdf(lower, upper, mean, standard deviation). In this case, z0 = 2.40, and we want to find the probability from this value to positive infinity.
4. Enter the command "normalcdf(2.40, 9999999, 0, 1)" using the appropriate values. The lower limit was set to 2.40 to calculate the probability from that value to positive infinity. We can use a large upper limit like 9999999 since we want to calculate the probability all the way to infinity.
5. Press the "ENTER" key to get the result. The calculator will display the answer as a decimal, which represents the probability that z0 is greater than or equal to 2.40.
The answer you mentioned, 0.008200, is the correct probability. Remember to round the result to the appropriate number of decimal places as required by your homework or test instructions.
It's helpful to familiarize yourself with the functions of your calculator and practice using them before your test, to ensure you know how to find probabilities efficiently.