Statistics - 9.2.2 Comparing Two Population Means (𝜎 Unknown, Equal Variances)

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We continue our study of the difference of population means where the population standard deviation is unknown. This time we focus on the calculations necessary when the variances are assumed to be equal and therefore will be pooled.

0:00 Intro
0:14 Conditions
0:52 Formulas
2:24 Example 1 - Problem Statement
4:30 Example 1 - Find Point Estimate and Critical Value
5:39 Example 1 - Find Margin of Error and Confidence Interval
7:10 Example 1 - Interpret the Interval
8:03 Example 1 - Excel
11:22 Example 2 - Excel Given Data
13:32 Up Next

This playlist follows the text, Beginning Statistics, 3rd ed, Warren, Denley, Atchley

  1. Kimberly Brehm
  2. comparing two population means sigma 1 and sigma 2 unknown
  3. confidence intervals for population means
  4. sigma unknown confidence interval
  5. two sample confidence interval for means sigma unknown
  6. statistics
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Комментарии
Автор

my class average for my recent discrete maths exam was 56%... but i got 94% just wanted to say thank you

baikal
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Thank you so much, you are so blessed.

positivewordalex
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How did you setup the cells to auto-execute the variables once you added the numbers for SE or Diff, Critical Value and Margin of Error?

fabianfajardo
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The question is how are you getting a Confidence Interval of 2.750? I learned that you get the degrees in freedom= 30 and the a= 0.01. I'm guessing you have a two tailed. I believe the video could have been better if you state the null hypothesis and the alternative hypothesis. People could get confuse.

greatbryan