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no t test is similar to z test because t test ie used for unknown observation and z is for the medicne

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12y ago

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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 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


Why would you use a z test rather than a t 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?

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Why would you use a t test rather than a z test?

When the sample size is greater than 30


How does the formula for the t test differ from the formula for the z test?

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.


When to t test z test t interval z interval etc?

Use a t-test when comparing the means of two groups, especially when the sample size is small (n &lt; 30) and the population standard deviation is unknown. A z-test is appropriate for large sample sizes (n ≥ 30) or when the population standard deviation is known. For confidence intervals, use a t-interval for smaller samples with unknown population standard deviation, and a z-interval for larger samples or known population standard deviation. Always check if the data meets the assumptions for each test before proceeding.


When is a t-test performed instead of a z-test?

A t-test is performed instead of a z-test when the sample size is small (typically n &lt; 30) and the population standard deviation is unknown. The t-test accounts for the increased variability and uncertainty in small samples by using the sample standard deviation rather than the population standard deviation. Additionally, it is often used when the data is approximately normally distributed.


Is the Z-test the same as Z-scores?

No, the Z-test is not the same as a Z-score. The Z-test is where you take the Z-score and compare it to a critical value to determine if the null hypothesis will be rejected or fail to be rejected.


What is the p value of a test statistic of 1.369?

The answer depends on what the test statistic is: a t-statistic, z-score, chi square of something else.