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..
:)
You 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).
When none of the angles are known, and using Pythagoras, the triangle is known not to be right angled.
that we can use it
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!?
No. "Circa" means "approximately" so whenever you use it, you are conveying that you don't know the exact year. Hope that helps.
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."
when is it appropriate to use arithmetic mean as opposed to median
One would use the word "whilst" as opposed to the word "while" if they were discussing something that had happened in the past tense as opposed to the present.
A person who is opposed to the use of war
Pacifists
A consumer product is a product designed and intended for use by an individual in private life, as opposed to use by a business or organization.
She was opposed to the idea of moving to a different city for a job.
pacifist
Your house is nice.You're (you are) going to be late.
those opposed tto use force against the south if states trieed to secede
No, they use the phrase just as anyone would use it.
A turbo that is specifically for use on gasoline engines (as opposed to diesel).
because they love unicorns