Two Independent Groups t-Test

n = 16 M = ? s = ? SS = ?

Single Sample t test Assignment 11 Problems

2 explanations of your data (using directional or non-directional language

depending on the research question)

tx

IV

population before tx

sample after tx

The independent variable is being manipulated with two treatments (hint: with an abstract problem like this, sometimes it helps to put in a real treatment, such as IV Pain Relievers with tx Ibuprofen and tx non-treatment)

H1: IV had an effect

H0: IV had no effect (all results are due to chance primarily through

sampling error)

Population µ = 74

σ = unknown

High Prob. (easy)

Low Prob. (hard)

α = .05 Prob. calcul ation

single sample t test

Step 3: Using Part III of formula sheet, determine the

critical value(s)

Accept H0 (due to chance)

Reject H0 & Accept H1

(due to real effect)

Step 1: Diagram your study (noting the data you are given)

Step 2: Create a table of calculations for each of the terms which you will need to solve the

formulas (not needed in this problem)

high

Step 4: Calculate the t statistic

1. s2 = SS df

2. sm = s2

n

3. t = 𝑀 −µ s m

Step 5: Compare critical t to the calculated t & make a

decision about the H0 hypothesis

Step 6: Report results professionally (see last step of

formula sheet)

x x2

(data from sample)

__ __ ∑= ∑=

∑(x)2=

2 outcomes 2 decisions

non-tx