Explore BrainMass

Explore BrainMass

    Real World Examples of Z and T-Tests for Stats Students

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Explain and give an example of: z-tests, t-tests, single sample t-tests, a dependent sample t-test, or an independent sample t-test.

    © BrainMass Inc. brainmass.com June 4, 2020, 2:37 am ad1c9bdddf

    Solution Preview


    To begin, z-tests are usually done for large samples (n greater than 30). The purpose is to determine whether there is a difference between a sample compared to an entire population. To perform a z test, the standard deviation of the population is usually known.


    A rental car company claims the mean time to rent a car on their website is 60 seconds with a standard deviation of 30 seconds. A random sample 36 customers attempted to rent a car on the website. The mean time to rent was 75 seconds. Is this enough evidence to contradict the company's claim?

    Since we have an n value of 36 in the above example with a known population standard deviation and we are aiming to find a ...

    Solution Summary

    This 500 word response provides explanations and original examples for several types of statistical tests.