1.If the reliability level is 90%, the variable of interest represents 25% of the population and the accepted margin of error is 4%. Determine the sample size:

a. When the size of the population is unknown.

b. If the population size is 60 units.

a. 519 b. 75

a. 319 b. 50

a. 386 b. 45

a. 400 b. 60

3.Determine the linear regression equation for the following data:

X Y Miligramos Defectos 2 4 3 5 5 7 10 19 15 O Y = 5.3 + 8.18X O Y = 0.305 + 1.518X O Y = 25.5 + 21.5X O Y = 10+ 15X