Z Test for the Mean
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Lesson Summary:
In this lesson, Professor Betis explains how to use the Z test for the mean in statistics. He walks through a problem where a researcher reports that the average time it takes a student to drive to their community college campus is less than 24 minutes. Using a left-tailed test and a significance level of alpha equals 0.01, they calculate the critical value, test value, and ultimately make a decision to reject the null hypothesis and support the claim. The lesson concludes with a summary of the results and a reminder to seek help if needed.
Lesson Description:
Using the Z test in Statistics.
Created by and copyright of Larry Perez. Funded by the state of California through Saddleback College. More information on videos, resources, and lessons at Algebra2Go.
Questions answered by this video:
- What is the Z test?
- How do you identify the claim and define the hypothesis?
- What is a left-tailed hypothesis test?
- What is an alternate hypothesis?
- What is a null hypothesis?
- What are critical values for a normal distribution for statistics?
- What is an acceptance and rejection region?
- What is a sample standard deviation and how do you find it?
- What is a Z-score and how do you find it?
- How do you decide whether to accept the null hypothesis or reject it?
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Staff Review
This video does a great job of stepping through a college statistics problem, defining the hypothesis and claim, and using the Z test for a normal distribution to test the claim. A really helpful video for brushing up on this vital statistics topic.
