What is the appropriate z critical value for each of the following confidence levels? a. 95% d. 80% b. 90% e. 85%

95% confidence level

80% confidence level

90% confidence level

85% confidence level

Step-by-step explanation:

For a confidence level of x, the critical value of z is the value of z with a pvalue of p given by the following formula:

Then we look at the z-table to find Z with a pvalue of p.

a. 95%

Z with a pvalue of

So

d. 80%

Z with a pvalue of

So

b. 90%

Z with a pvalue of

So

e. 85%

Z with a pvalue of

So

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer