Which of the following is not required to determine minimum sample size to estimate a population mean? choose the correct answer below.
a. the desired confidence level
b. the desired margin of error
c. the size of the population, n
d. the value of the population standard deviation, sigma

c

Step-by-step explanation:

The minimum sample size does not depend on the size of the population

57.1428 minutes

Step-by-step explanation:

Power : Time

100 : 20

35 : x

if POWER increase then TIME decrease, it means both are inversely proportional to each other

x/20 = 100/35

x = (100/35) * 20

x = 400 / 7

x = 57.1428

where x is basically the time in minutes, So time = 57.1428 minutes