Question

question 12
for statistical purposes, there usually is not much reason to differentiate between interval and ordinal scales of measurement.
true
false
2 pts
question 13
what is the value of σx² for the scores 2, 4, and 5?
11
45
36
33
2 pts
question 14
what is the value of σ(x + 1) for the scores 2, 3, 5?
6
9
11
13

Explanation:

Step1: Answer Question 12

Interval scale has equal - intervals and no true zero, while ordinal scale has rank - order but not equal intervals. They are different in statistical analysis, so the statement is false.

Step2: Answer Question 13

Calculate $\sum X^{2}$ for scores $X = 2,4,5$. $\sum X^{2}=2^{2}+4^{2}+5^{2}=4 + 16+25 = 45$.

Step3: Answer Question 14

For scores $X = 2,3,5$, first calculate $X + 1$ for each score: $2 + 1=3$, $3+1 = 4$, $5 + 1=6$. Then $\sum(X + 1)=3 + 4+6=13$.

Answer:

Question 12: B. False
Question 13: B. 45
Question 14: D. 13