The researchers recruit 30 undergraduate students to take part in the study and randomly assign them to be in an expressive writing group or a control group. Students in the expressive writing group are instructed to write four 20 - minute essays over four consecutive days about their most traumatic life experiences. Students in the control group write four 20 – minute essays over consecutive days
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
A team of researchers is interested in the effect on physical health of writing about thoughts and feelings associated with traumatic life
EWG: 75, 86, 77, 91, 68, 74, 62, 93, 82, 79, 94, 56, 79, 86, 90, 97
CWG: 81, 76, 71, 70, 62, 50, 58, 63, 76, 64, 65, 72, 52, 59
The researchers were interested in identifying a positive or a negative health effect of expressive writing. Run the proper t test to see if this previous research is supported.
Independent variable: Writing style Dependent variable: Physical Health
Statistical Hypotheses: H0:_ ___H1: ____________________
State Hypotheses in words:
H0: H1: _
Proper t-test: _____________ One-tailed or two-tailed? _ ___________
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