Calculating Z-Score Probabilities

This video tutorial demonstrates how to use a calculator to find probabilities in a normal distribution. It covers setting up the calculator, calculating lower and upper tail probabilities, and finding probabilities between values, including those with negative z-scores. The tutorial also explains how to calculate probabilities in a range not starting from zero. The video concludes with a call to action to like and share the content.

What is the first step to set up your calculator for normal distribution problems?

• Press mode until you see 'sd' and choose it

• Turn off the calculator

• Press the 'on' button twice

• Select the 'graph' mode

How do you find the lower tail probability for a z-score using the calculator?

• Press shift, then 3, and choose 'p'

• Press shift, then 3, and choose 'r'

• Press mode, then 1, and choose 'q'

• Press shift, then 2, and choose 'd'

What is the probability of z being less than 1.305?

• 0.09595

• 0.40405

• 0.90405

• 0.70244

Which option represents the upper tail probability calculation for a z-score?

• Press shift, then 3, and choose 'p'

• Press shift, then 3, and choose 'r'

• Press shift, then 2, and choose 'd'

• Press mode, then 1, and choose 'q'

What is the probability of z being greater than 1.305?

• 0.90405

• 0.09595

• 0.40405

• 0.70244

How do you calculate the probability of z being between 0 and 1.305?

• Press mode, then 1, and choose 'p'

• Press shift, then 2, and choose 'd'

• Press shift, then 3, and choose 'r'

• Press shift, then 3, and choose 'q'

What is the probability of z being less than -1.238?

• 0.89214

• 0.40405

• 0.70244

• 0.10786

How do you find the probability of z being more than -1.238?

• Press mode, then 1, and choose 'q'

• Press shift, then 2, and choose 'd'

• Press shift, then 3, and choose 'r'

• Press shift, then 3, and choose 'p'

What is the probability of z being between -1.238 and 0?

• 0.70244

• 0.39214

• 0.89214

• 0.10786

Which method can be used to find the probability of z being in a range not starting from zero?

• Divide the lower tail probability by the upper tail probability

• Multiply the lower and upper tail probabilities

• Add the lower and upper tail probabilities

• Subtract the lower and upper tail probabilities from 1