Question

Questions 1-5 are based on scenario 1: Does public speaking stress you out? How much does it stress you out? Many researchers are interested in studying how people respond to stressful social situations. One study brought participants into a laboratory, measured their cortisol (stress hormone) levels when they first arrived, made them give a speech in front of a group of strangers with only 5 minutes to prepare, and then measured their cortisol levels again to see if they had changed.

1. Which of the following is the null hypothesis for scenario 1?

A. cortisol levels before the speech > cortisol levels after the speech

B. cortisol levels before the speech = cortisol levels after the speech

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2. Which of the following is the alternative hypothesis for scenario 1?

A. cortisol levels before the speech = cortisol levels after the speech

B. Cortisol levels before the speech > cortisol levels after the speech

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3. Which of the following is the independent variable?

a. The participants

b. Cortisol Levels

c. The speech

d. The laboratory

e. There is no independent variable in this study

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4. Which of the following is the dependent variable

a. There is no dependent variable in this study

b. The participants

c. Cortisol levels

d. The speech

e. The laboratory

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5. What is the best statistical test to use to test the hypothesis in scenario 1?

a. T-test for the significance of the correlation coefficient

b. Regression Analysis

c. One-way ANOVA

d. Correlation Coefficient

e. F-test

f. Independent sample t-Test

g. P-test

h. Dependent sample t-Test

i. z-score

j. z-Test

Answer 1

1.. cortisol levels before the speech = cortisol levels after the speech

Null hypothesis always states that there is no significant difference/relationship between variables

2.Cortisol levels before the speech > cortisol levels after the speech

Alternative hypothesis always states that there is a significant difference /relationship between variables. It is the hypothesis that they are trying to prove

3.c. The speech: public speaking (speech) impacts stress level

4.c. Cortisol levels : the stress level (cortisol) depends upon the situation they're exposed to

5.Dependent sample t-Test : also known as paired sample t test is used on the same set of participants in order to determine a difference based on a dependent variable