Question

You are most likely to use an independent-samples t-test analysis when your study ____

A) none of the other alternatives are correct

B) uses the same sample for the two different treatment conditions

C) uses the data from one sample to evaluate a hypothesis about the population mean

D) uses two different samples for two different treatment conditions being compared

Answer 1

Correct answer- option D

Independent samples t-test analysis uses two different samples for two different treatment conditions being compared because Independent samples refers to condition in which experimenter take two groups, that are not correlated with each other.

For example- let's take two different groups of students to compare effectiveness of different teaching methods for psychology classroom. one of the group is taught using lecture method and the other by demonstration method. we will be comparing the performance of students using a psychology test( compare mean scores of both groups in psychology test).  

first group of boys- 30 boys (N1) second group of girls- 28 girls(N2)

Given lecture method (condition/treatment 1) Given demostration method (condition/treatment 2) Mean score of boys- M1 Mean score of boys- M2

And now here we have to administer Independent samples t-test analysis.

Incorrect answers-

A) none of the other alternatives are correct- Because correct answer is given

B) uses the same sample for the two different treatment conditions-

This is a condition for t-test for correlated groups.

C) uses the data from one sample to evaluate a hypothesis about the population mean-

This option is not explaining any specific condition.