Finding Z-Scores with TI-84 Plus

This video tutorial demonstrates how to use the TI-84 Plus calculator to find the Z-score for a given value. It guides the viewer through accessing the distribution function, inputting the desired value, and interpreting the resulting Z-score. The example used is finding the Z-score for 0.025, which is approximately 1.96. The tutorial emphasizes the simplicity of changing the input value to find different Z-scores.

What is the primary purpose of the video tutorial?

• To show how to graph functions on the TI-84 Plus

• To explain the history of the TI-84 Plus calculator

• To demonstrate how to find z-scores using the TI-84 Plus

• To teach how to use the TI-84 Plus for basic arithmetic

What is the first step in finding a z-score using the TI-84 Plus?

• Turn off the calculator

• Enter the probability directly

• Press the '2nd' button

• Press the 'graph' button

Which button do you press first to access the distribution menu on the TI-84 Plus?

• The 'graph' button

• The 'mode' button

• The '2nd' button

• The 'alpha' button

After pressing '2nd', which button should be pressed to access the distribution menu?

• The 'clear' button

• The 'stat' button

• The 'math' button

• The 'vars' button

What is the function used to find the z-score for a given probability?

• binomcdf

• poissoncdf

• invNorm

• normcdf

What value is entered into the 'invNorm' function to find the z-score for 0.025?

• 0.975

• 0.025

• 0.5

• 1.96

Which menu option is selected after accessing the distribution menu to find a z-score?

• Option 4: poissoncdf

• Option 3: invNorm

• Option 2: binomcdf

• Option 1: normcdf

What is the purpose of the 'invNorm' function on the TI-84 Plus?

• To graph functions

• To find z-scores for given probabilities

• To solve equations

• To calculate probabilities

What is the approximate z-score for a probability of 0.025?

• 0.025

• 2.58

• 1.96

• 0.5

What does the z-score of 1.96 represent in the context of the video?

• The mean of a distribution

• The standard deviation

• The probability of an event occurring

• The z-score for a left-tail probability of 0.025