1. Suppose on a sample of people it is found the mean salary is equal to 30,000. When we use a statistic like this to simply describe a sample, this is an example of
a) an inferential statistic
b) a descriptive statistic
c) a sample median
d) random sampling
e) b and

2. If we collect observations on 100 people, and measure their IQ, the 100 observations is:
a) a sample
b) a population
c) a sample with likely no variability
da or bare possibilities, depending on the score of the investigation
e) a variable

3. Suppose the trace of a matrix is equal to 10. If this matrix is also an identity matrix, how
many rows must the matrix have?
a) 10
b) equal to the number of columns of the matrix
c) 0
D) A and b
E) impossible to say without further information

4. If it is universally known in general that all cats have four legs, then the conclusion that your particular cat has four legs is an example of:

A.) Inductive inference
B.) Deductive inference
C.) statistical inference
D.) mathematical function
E.) None of the above