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QUESTION 1
An educational psychologist wanted to know the effects of four different methods of teaching arithmetic. Using 12 classrooms, each method was used in the classes. At the end of the school year, all the pupils took the same achievement test, and the means for groups receiving different methods were compared. Answer the following questions about the study.
a. What was the dependent variable?
b. What was the independent variable?
c. What was a controlled variable?
d. Give an example of a parameter.
QUESTION 2
Epstein compared “feelings of fear and anxiety” of experienced parachutists (more than 100 jumps) to those of novices (fewer than 10 jumps). Feelings were measured on a questionnaire with scores from 1 (calm) to 10 (very nervous). The subjects were all men in their 20s. Identify:
a. the dependent variable
b. the independent variable, and the names of the levels
c. a controlled extraneous variable
d. a quantitative variable
e. a categorical variable
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QUESTION 3
Find the mean, median and mode of these numbers: 5, 4, 2, 1, 6, 5, 3, 2, 4, 2, 5, 5, 2
Round all answers to the hundreth place.
QUESTION 4
Please interpret the results and write up the results according to the handbook for the following scenario.
Is there a relationship between time spent studying and quiz scores? A student ran a correlation test and had the following results:
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QUESTION 5
Please interpret the results and write up the results according to the handbook for the following scenario.
Is there a relationship between GPA and ACT composite scores? A student ran a correlation test and had the following results:
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