(1) In a set of raw scores for a teacher-constructed test, what will be the shap

Question

(1) In a set of raw scores for a teacher-constructed test, what will be the shape of the distribution around the mean?
a. normal
b. bimodal
c. skewed
d. it could be distributed in any of these ways

(2) You are constructing a histogram for scores that range from 70 to 100 in whole points. Frequencies range from 3 to 10; that is, every whole-point score between 60 and 100 occurs at least 3 times, and at least one score occurs 10 times. Which of these would probably be the best range and size for the score intervals along the X-axis?
a. 1-point intervals from 70 and 100
b. 1-point intervals from 0 and 100
c. 5-point intervals from 70 and 100
d. 10-point intervals from 70 and 100

(3) The statement that a person who scores 120 has twice as much of the trait being measured as someone who scores 60 is appropriate for:
a. a variable measured on an interval scale
b. a variable measured on a ratio scale
c. any continuous variable
d. any test whose scores are normally distributed

(4) You are looking at a frequency table for a large number of scores. Without doing any further calculating, which measure of central tendency can you immediately report?
a. mode
b. median
c. mean
d. none of these

(5) If r = -1.00, which one of the following will be true?
a. Scores on X will be of no use in predicting scores on Y
b. Scores on X can be perfectly predicted from scores on Y
c. The scores on X and Y are both negative
d. The relationship becomes difficult to interpret

Explanation / Answer

1) a. normal

2. c. 5-point intervals from 70 and 100

3. c. any continuous variable

4. a. mode

5. b. Scores on X can be perfectly predicted from scores on Y

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