Hypothesis Testing Problems - Z Test & T Statistics - One & Two Tailed Tests 2

This statistics video tutorial provides practice problems on hypothesis testing. It explains how to tell if you should accept or reject the null hypothesis. It gives two examples - one involving the z-test and the other involving the t-test or t-statistic. One of those examples include a one tailed test and the other contains an example of the two tailed test.

Full-Length Math & Science Videos:

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Confidence Intervals & Margin of Error:

Find The Z-Score Given Confidence Interval:

Student's T-Distribution:

Hypothesis Testing - Null & Alternative:

Type I and Type II Errors:

One Tailed and Two Tailed Tests:

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Test Static For Means & Pop Proportions:

Hypothesis Testing Problems:

P-Value Method - Hypothesis Testing:

Hypothesis Testing - Proportions:

Difference of 2 Means - H Testing:

Cohen's D - Pooled Standard Deviation:

Hypothesis Testing - 2 Proportions:

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Matched or Paired Samples t-Test:

Chi Square Test:

Chi Square Distribution Test:

Test of Independence - Chi Square Dist:

Final Exams and Video Playlists:

[shawnscientifica]

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[yourpapa]

To those wondering on the Z-score values of 1.96 and confidence value of 95%:

Confidence level (CL) formula = 1 - (confidence value) = 1 - 0.95 = 0.05, and we divide this by 2 (0.05/2) to get the alpha values on both tails ~ 0.025.

You can also use this formula A = (1-CL)/2 which gives you your alpha for one tail. As these graphs are symmetric we put the alpha values on both sides.

Once you have this value you go on your Z-score table.

At alpha value = 0.025, look down at the (deg of freedom which is given by formula: 1 - n, where n is sample size) but since we have 1 - 40 = 39...
The 39 is no where on the freedom column. In this case we use the infinity value which is: 1.960 ~ 1.96

Cheers

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[feleciabarnes]

Thank you for taking your time and going through The Z and t procedures in a step-by-step manner in which I could understand understand. Furthermore I appreciate the way you compared the t critical value To the T test statistic using the formula which now helps me to understand how you reject or fail to reject the null hypothesis.

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[mr.m]

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[RomeoJ]

Makes so much sense! This week in my MATH302 course we’re going over hypothesis testing for sample T-Test, sample Proportion, 2 Proportions, 2 independent samples, paired samples.

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