Some people believe that second born subjects are more intelligent (higher IQ test). Given the data, your job is to perform the appropriate statistical test or procedure and help them decide.
What test did you perform?

a. Regression
b. Multiple regression
c. One-sided t-test
d. Two-sided t-test

C

Step-by-step explanation:

When to use regression test?

This is done to find the relationship between 2 variables. One dependent and one independent.

When to use Multiple regression test?

Extension of regression test. It is used to predict value of 1 variable when it depends on 2-3 other variables. Multivariable, basically.

When to use 1-sided t-test?

We check for possibility of relationship of something from one side. 1 side effect. With a hypothesis and its alternate.

When to use 2-sided t-test?

This is same as 1-tailed but it looks for possibility from 2sides. A hypothesis and alternate, whether less or more.

Now, Options A and B are not right since we aren't comparing 2 variables here. People believe second born subjects are more intelligent. We have to perform a test to see whether this is true or not. One sided answer. So, we will use One-sided t-test.

The difference is 5,100m?