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How To Find The Z Score, Confidence Interval, and Margin of Error for a Population Mean Teacherflix 8 Views • 2 years ago

This statistics video tutorial explains how to find the z-score that will be used to find the confidence interval and margin of error for a population mean. This video contains 2 example problems in which you're asked to find a 90% and 95% confidence interval given the population standard deviation, sample mean, and sample size. By the way, the margin of error is also known as the error bound. This video also explains the difference between the confidence interval and the confidence level. It also discusses the meaning of the greek symbol alpha as it is used in this context.

Introduction to Statistics:
https://www.youtube.com/watch?v=XZo4xyJXCak

Introduction to Probability:
https://www.youtube.com/watch?v=SkidyDQuupA

Central Limit Theorem:
https://www.youtube.com/watch?v=4YLtvNeRIrg

Standard Error of The Mean:
https://www.youtube.com/watch?v=UuHqq09nTAk

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Confidence Intervals & Margin of Error:
https://www.youtube.com/watch?v=DT-fPG0Hff8

Find The Z-Score Given Confidence Interval:
https://www.youtube.com/watch?v=sJyZ9vRhP7o

How To Calculate The Sample Size:
https://www.youtube.com/watch?v=nkkxu09K3ZA

Student's T-Distribution:
https://www.youtube.com/watch?v=MUD390jtgQs

Confidence Interval-Population Proportion:
https://www.youtube.com/watch?v=_aQTgv_OOSU

Chebyshev's Theorem:
https://www.youtube.com/watch?v=ZXq0ygaZuwg

_____________________________________
Hypothesis Testing - Null & Alternative:
https://www.youtube.com/watch?v=wiYJWyfdGg4

Type I and Type II Errors:
https://www.youtube.com/watch?v=9yQm9F2_yIk

One Tailed and Two Tailed Tests:
https://www.youtube.com/watch?v=XHPIEp-3yC0

Test Static For Means & Pop Proportions:
https://www.youtube.com/watch?v=Hag0GW9B6EY

Hypothesis Testing Problems:
https://www.youtube.com/watch?v=zJ8e_wAWUzE

____________________________________
Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

P-Value Method For Hypothesis Testing Teacherflix 5 Views • 2 years ago

This statistics video explains how to use the p-value to solve problems associated with hypothesis testing. When the p-value is less than alpha, you should reject the null hypothesis and vice versa. This video discusses when you should use a one tailed test compared to a two tailed test. It contains two example problems that illustrates how to use the p-value method to determine if you should reject or not reject the null hypothesis.

Confidence Intervals & Margin of Error:
https://www.youtube.com/watch?v=DT-fPG0Hff8

Find The Z-Score Given Confidence Interval:
https://www.youtube.com/watch?v=sJyZ9vRhP7o

Student's T-Distribution:
https://www.youtube.com/watch?v=MUD390jtgQs

Hypothesis Testing - Null & Alternative:
https://www.youtube.com/watch?v=wiYJWyfdGg4

Type I and Type II Errors:
https://www.youtube.com/watch?v=9yQm9F2_yIk

One Tailed and Two Tailed Tests:
https://www.youtube.com/watch?v=XHPIEp-3yC0

_______________________________________
Test Static For Means & Pop Proportions:
https://www.youtube.com/watch?v=Hag0GW9B6EY

Hypothesis Testing Problems:
https://www.youtube.com/watch?v=zJ8e_wAWUzE

P-Value Method - Hypothesis Testing:
https://www.youtube.com/watch?v=8Aw45HN5lnA

Hypothesis Testing - Proportions:
https://www.youtube.com/watch?v=76VruarGn2Q

Difference of 2 Means - H Testing:
https://www.youtube.com/watch?v=UcZwyzwWU7o

Cohen's D - Pooled Standard Deviation:
https://www.youtube.com/watch?v=GDe4M0xEghs

Hypothesis Testing - 2 Proportions:
https://www.youtube.com/watch?v=pCbNUnZ98oE

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Matched or Paired Samples t-Test:
https://www.youtube.com/watch?v=JiQR0lHLe74

Chi Square Test:
https://www.youtube.com/watch?v=HKDqlYSLt68

Chi Square Distribution Test:
https://www.youtube.com/watch?v=O6a76Dnn104

Test of Independence - Chi Square Dist:
https://www.youtube.com/watch?v=y5nxiL6civU

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

Invertebrate Animals | Educational Video for Kids Teacherflix 2 Views • 6 months ago

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Today we are going to learn about the invertebrate animals

You all know that the animals are divided into two big groups, the vertebrates that have an internal skeleton formed by bones and the invertebrates that have no bones.

All the invertebrates are oviparous, and we classify them in 6 big groups:

Sponges, jellyfish, corals, worms, mollusks, echinoderms and arthropods

The sponges are aquatic animals, that are sac shaped and their body is full of pores. It is very easy to remember this group because many times we use them in the shower for our personal hygiene. Yes, many of the sponges we use in the shower are invertebrate animals.

The jellyfish are invertebrate animals that live in the ocean. Their bodies are gelatinous and have tentacles. The truth is that when they appear in the beach it is very annoying because their tentacles have small venomous stingers that produce very unpleasant bites.

Corals are tiny marine animals that produce limestone residue, which give rise to beautiful shapes.

Do you know this animal? Exactly, it’s a worm. Worms are soft and long invertebrate animals that move by dragging their body in the ground, because they have no feet. They can be aquatic or terrestrial. There are some worms that can be harmful and that is why we must be careful with them.

Can you see this snail? Well snails form part of the mollusk group.

Mollusks have a soft body, without legs and can also be aquatic or terrestrial.

Some, like this snail, this clam and mussels, protect their soft body with shells, but there are other mollusks that don’t have a shell to protect themselves like slugs or octopuses.

The echinoderms are exclusively aquatic animals. Their bodies have calcareous plates that form a shell.

Some echinoderms are balloon shaped and are covered in spikes that they use to defend themselves, like sea urchins.
Others are star shaped, and are of course called starfish.

The arthropods are the most abundant animals on the earth. Of every 100 animals that exist, 80 are arthropods.

These invertebrate animals have their body covered by an external skeleton called a cuticle.
The most common way to classify the arthropods is by the number of legs they have. This way we can classify them in four big groups.

Arthropods with 6 legs. In this group insects like ants and flies are present.

Arthropods with 8 legs, where for example the arachnids like spiders and scorpions are.

Arthropods with 10 legs include the crustaceans, like crabs and lobster.

Arthropods with more than 10 legs like this centipede that as you can see has much more than 100 legs are called myriapods.

Well now you know a bit more about the invertebrates.

Bye friends, and don’t forget to subscribe to the happy learning channel.