A Set of Sample Scores from an Experiment Has an N

question 33

Multiple Choice

A set of sample scores from an experiment has an N = 28 and a mean = 52. H 1 is directional, predicting an effect of the independent variable which decreases the magnitude of the dependent variable. H 0 asserts the sample is a random sample from a population of scores where µ = 55 and s = 12. a = 0.05_{1 tail}. Using the z test to analyze the data, what is the correct conclusion regarding H 0 ?

• A) reject H 0 ; the independent variable has a real effect
• B) retain H 0 ; we cannot conclude that the independent variable has a real effect
• C) accept H 0 ; the independent variable has no effect
• D) reject H 0 ; the independent variable has no effect

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Definitions:

Coefficient of Determination

A statistic used in the context of regression analysis to assess the proportion of the variance in the dependent variable that can be explained by the independent variable(s).

Skin Cancer

A type of cancer that develops in the cells of the skin, often due to exposure to ultraviolet radiation from the sun or tanning beds.

UV's

Short for ultraviolet rays, which are electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays.

Pearson Coefficient

A measure of the linear correlation between two variables, ranging from -1 to 1, where 1 implies a perfect positive correlation and -1 a perfect negative correlation.