0
z- statistics is applied under two conditions:
1. when the population standard deviation is known.
2. when the sample size is large.
In the absence of the parameter sigma when we use its estimate s, the distribution of z remains no longer normal but changes to t distribution.
this modification depends on the degrees of freedom available for the estimation of sigma or standard deviation.
hope this will help u....
mona upreti..
:)
Still curious? Ask our experts.
Chat with our AI personalities
Beau
Rafa
ProfessorYou use the t-distribution as opposed to the z-distribution when:
(1) you are testing a hypothesis about the population mean and the standard deviation is unknown (estimated from the sample).
(2) You are constructing a confidence interval for the population mean when the population standard deviation is unknown (estimated from the sample).
Add your answer:
Earn +20 pts
What situation would you be FORCED to use law of cosines as opposed to law of sines?
When none of the angles are known, and using Pythagoras, the triangle is known not to be right angled.
Explain how you know to use a variable in an addition or subtraction expression?
that we can use it
Why do you need to use a calculator?
If you don't know what the answer is to a hard maths question people use calculators. Like 644 times 1076? Who would know that!?
Can you use circa when you know the exact year?
No. "Circa" means "approximately" so whenever you use it, you are conveying that you don't know the exact year. Hope that helps.
Is friends an adverb?
No. Friends is a plural noun, with the adjective form friendly, which might rarely be used as an adverb, as opposed to the awkward for "friendlily." It is easier to use a prepositional phrase such as "in a friendly way."
