19/A teacher rated the reading ability level of eight fourth grade children in a special math program. The reading level ratings were as follows: 2, 3, 3, 4, 3, 5, 1, 6. Compute the standard deviation. A)1.40 B) 0 C)1.60 D) 1.50 21/In a chi-square test, the variables are measured on a: A)ordinal level B)ratio level C)nominal level D)interval level