What is the Z-test for Means in Statistics? Easy Explanation for Data Science Interviews

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The z-test is one of the most basic, and commonly used hypothesis tests. There are many data science interview questions on z-tests, so in this video we’ll dive into when to use it, and how to conduct both one-sample and two-sample z-tests for means.
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Contents of this video:
====================
00:00 Introduction
01:06 When to use the z-test?
01:27 Assumptions of z-tests
02:58 Z-test for One Sample Mean
06:35 Obtain the confidence interval for population mean
08:11 Comparing the means of two populations

Опубликовано:

3 авг 2024

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Комментарии : 11

@antoinescarcella3932 10 дней назад

Very good explanation thank you! That being said, I might have picked up a tiny mistake in the code. Indeed, should it not be "observed_z_score = blabla / sample_sd" instead of "observed_z_score = blabla / sigma" since the sigma variable is part of what we are not supposed to know (population standard deviation)? If I am right, this must have completely thrown off the z score calculation.

@AllieZhao Год назад

The best part is you add coding with the theory and explained quite well!

@emma_ding Год назад

Thanks, Allie! So glad you found it helpful! Thanks for watching. 💛

@vinnuvinay7489 Год назад

@@emma_ding Hi Emma, Can you also share your notes

@shirleyfdfd Год назад

The presentation is super helpful and clear! Thanks Emma! Could you please share the notes?

@emma_ding Год назад

Of course! You can download all the PDFs of my Notion pages at www.emmading.com/get-all-my-free-resources. Enjoy!

@abhilaks Год назад

Thanks for the video Emma, it's really handy! Just a suggestion - Might be useful to also share an example of a one-tailed test (for example when we want to test if the population mean is greater than or lesser than a target value).

@emma_ding Год назад

Thank you for your thoughtful feedback, Abhinav! I appreciate you taking the time to share that with me. I will take it into consideration for future videos. 😊

@Levy957 Год назад

i love this woman

@teddy911 Год назад

我来组成一楼！

@emma_ding Год назад

Many of you have asked me to share my presentation notes, and now… I have them for you! Download all the PDFs of my Notion pages at www.emmading.com/get-all-my-free-resources. Enjoy!