A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 20 is about 4.472. Thus, the square root of 20 is not an integer, and therefore 20 is not a square number.
Answer:
We reject the null hypothesis.
Step-by-step explanation:
We are given the following information in the question:
Sample size, n = 71
Population variance is known.
Level of significance, α = 0.08

The null and alternate hypothesis are:

We use one-tailed z test to perform this hypothesis.
Formula:

Now, 
Since,

We fail to accept the null hypothesis and reject it and accept the alternate hypothesis.
Answer:
The probability that one of the minority candidates is hired is P;
P = Nm/Nt
P = 2/5 = 0.4
Step-by-step explanation:
Total number of Candidates on the list Nt= 5
Number of minority candidates on the list Nm= 2
The probability that one of the minority candidates is hired is P;
P = Nm/Nt
P = 2/5 = 0.4