36,219 views
15 votes
15 votes
In statistics, how do I find the p-value? I understand how to get the z-value. Please help! I am so confused. Thank you in advance!

User Raw Hasan
by
3.1k points

1 Answer

15 votes
15 votes

SOLUTION:

Step 1:

In this question, we are meant to discuss the p-value.

1. The p-value is calculated using the sampling distribution of the test statistic under the null hypothesis, the sample data, and the type of test being done (lower-tailed test, upper-tailed test, or two-sided test).

2.

3. What is the p-value in statistics?

The p-value is a number, calculated from a statistical test, that describes how likely you are to have found a particular set of observations if the null hypothesis were true. P-values are used in hypothesis testing to help decide whether to reject the null hypothesis.

4. How do I know when the test is left-tailed, right-tailed, or two-tailed?

Left-tailed test: The critical region is in the extreme left region (tail) under the curve.

Right-tailed test: The critical region is in the extreme right region (tail) under the curve.

5. How do you know when to use a one - tailed or two - tailed test?

This is because a two-tailed test uses both the positive and negative tails of the distribution.

In other words, it tests for the possibility of positive or negative differences. A one-tailed test is appropriate if you only want to determine if there is a difference between groups in a specific direction.

6. The formulae that involves z-score:

7. The formulae that involves p -value and standard deviation:

In statistics, how do I find the p-value? I understand how to get the z-value. Please-example-1
In statistics, how do I find the p-value? I understand how to get the z-value. Please-example-2
In statistics, how do I find the p-value? I understand how to get the z-value. Please-example-3
User Eigo
by
3.0k points