Comparing Supplier Pass Rates

This video tutorial explains how to evaluate the Z-test statistic and p-value for a two proportion Z-test using the TI-83 and 84 calculators. It covers setting up the problem with a current and prospective supplier, stating the null and alternate hypotheses, and calculating the pooled proportion. The tutorial guides through the steps of calculating the standard error and using the calculator to perform the 2-PropZTest. Finally, it interprets the results, concluding that the prospective supplier has a higher pass rate.

What is the main focus of this video tutorial?

• Understanding the one proportion Z-test

• Calculating mean and median

• Learning how to use a TI-83 calculator

• Evaluating the Z-test statistic and p-value for the two proportion Z-test

What is the problem being addressed in the video?

• Finding the best supplier based on cost

• Comparing two different statistical tests

• Determining if a prospective supplier has a higher pass rate than the current supplier

• Calculating the average pass rate of a supplier

What is the null hypothesis in this scenario?

• The prospective supplier has a lower pass rate

• The prospective supplier has a higher pass rate

• The current supplier has a higher pass rate

• The true proportions of passing inspection are the same for both suppliers

What is the alternate hypothesis in this test?

• The true proportions of passing inspection are the same for both suppliers

• The prospective supplier has a higher pass rate

• The current supplier has a higher pass rate

• The prospective supplier has a lower pass rate

What is the significance level referred to in the video?

• Alpha

• Delta

• Gamma

• Beta

What assumption is made about the samples in this test?

• They are independent and non-random

• They are dependent and non-random

• They are independent and random

• They are dependent and random

What is the pooled proportion used for?

• To calculate the mean

• To find the mode

• To check conditions and calculate SE

• To determine the median

How is the pooled proportion calculated?

• By multiplying the total number of yeses by the total sample size

• By dividing the total number of yeses by the total sample size

• By adding the total number of yeses to the total sample size

• By subtracting the total number of yeses from the total sample size

What is the significance of the pooled proportion in the Z-test?

• It is used to determine the median

• It is used to calculate the mean

• It is used to find the mode

• It is used to check conditions and calculate SE

What is the purpose of using the calculator in this test?

• To calculate the median

• To perform the 2-PropZTest

• To find the mean

• To determine the mode