If the estimated population standard deviation based on previous studies is 20 percent, the acceptable error is plus or minus 5 percent, and the z-value for a 95 percent level of confidence is 1.96, the needed sample size is approximately:

The needed sample size is approximately 61.46 individuals.

Step-by-step explanation:

We can use the following formula to obtain the sample size:

Where is the standard deviation, is the quantile of the normal distribution with area of and is the acceptable error.

We would need a sample size of 62 individuals.

no, the equation would be invalid since they are both not equal.

step-by-step explanation:

here you got

4y-6+4y 2-9

first, you would simplify the equation on the form.

4y-6+4y 2-9

then, move all the terms that contains a y to the left and all the other terms to the right.

+4y-4y+-9-6

finally, you will simplify the left and the right side of the equation.

y=-3

5.25 ounces

step-by-step explanation:

divided 3/4 and 6