0
How does the formula for the t test differ from the formula for the z test?
Ptresvant
When we use a z-test, we know the population mean and standard deviation. When we use a t-test, we do not know the population standard deviation and thus must estimate this using the sample data that we have collected. If you look at your z-table and t-table, tcrit for df(infinity) = zcrit because at df(infinity) we would have an entire population and no longer need an estimate.
Wiki User
∙ 16y ago
Add your answer:
Earn +20 pts
Is T test similar to Z test?
no t test is similar to z test because t test ie used for unknown observation and z is for the medicne
Is a z test or t test used more often?
t test, because the z test requires knowing the population standard deviation and that's rare. The t test embodies an estimate of the standard deviation.
What is the dimensional formula of theory of relativity?
I*I = x*x + y*y + z*z - t*t
What is a t-test?
a t test is used inplace of a z-test when the population standard deviation is unknown.
What is the difference between t test and z test in hypothesis testing?
It depends on the population.Use t-test for a small population, N < 30; otherwiase, apply z-test or when N>=30.
How do you decide whether to use a z test or a t test when testing a hypothesis about a population mean?
You use a z test when you are testing a hypothesis that is using proportions You use a t test when you are testing a hypothesis that is using means
What is the formula for calculating a spot rate?
The formula is as follows:Because, in general, a zero-coupon bond price is...Z(t,T) = 1/[1+r(t,T)]TSO the spot rate would then equal...r(t,T) = [1/Z(t,T)1/T]-1
Why would you use a z test rather than a t test?
When the sample size is greater than 30
Why would you use a t test rather than a z test?
When the sample size is greater than 30
What is the difference between 2 sample z test statistic and 2 sample t test statistic?
erwtwertgrtewh
Formula for z-test?
The z score is calculated from the distance of a value from the distribution center divided by the standard dev. (x-xbar)/st. dev
What is the excel formula for a Z test?
Excel has a ZTEST function. It has the format ZTEST(array, µ0, sigma).
