Hello when can I use this type of formula on what kind of question may I ask for an example?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
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Hello when can I use this type of formula on what kind of question may I ask for an example?

Section:
Schedule:
Case 3: 0₁² #0₂² and unknown
Но
H₁-H₂= do
Test statistic
t =
df=
(x₁-x₂)-do
$1²,52²
721 722
n1
n₁-1
+
2
12₂
N₂
n₂-1
H₂
H₁-H₂ < do
H₁-H₂> do
H₁-H₂ # do
Date:
Critical region
t<-tg
t> ta
|t|>ta/2
Example: A group of researchers selected 50 countries and classified them according to three GNP levels:
Low (less than $50B), Moderate ($50B - $174B) and High (above $175B). For each classification, the average
life expectancy was determined:
Transcribed Image Text:Section: Schedule: Case 3: 0₁² #0₂² and unknown Но H₁-H₂= do Test statistic t = df= (x₁-x₂)-do $1²,52² 721 722 n1 n₁-1 + 2 12₂ N₂ n₂-1 H₂ H₁-H₂ < do H₁-H₂> do H₁-H₂ # do Date: Critical region t<-tg t> ta |t|>ta/2 Example: A group of researchers selected 50 countries and classified them according to three GNP levels: Low (less than $50B), Moderate ($50B - $174B) and High (above $175B). For each classification, the average life expectancy was determined:
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