Question

If it were later determined that it was important to be more than $90\%$ confident and a new survey was commissioned, how would it affect the minimum number you need to survey? Why?

Short answer

It would decrease, because the $z$-score would decrease, which reducing the numerator and lowering the number.

Step-by-step solution

Given Information

The confident level is$90\%$.

Explanation

The probability that a value will fall within the upper and lower boundaries of a probability distribution is called a confidence interval. So, if the method or investigation is repeated, you may be 90 percent confident that the values of the data will fall between the upper and lower boundaries.