What is the minimum sample size required to estimate a population mean with 90% confidence when the desired margin of error is D

The expression for the required minimum sample size is .

Step-by-step explanation:

The (1 - α) % confidence interval for population mean is:

The margin of error for this interval is:

Confidence level = 90%

α = 10%

Compute the critical value of z for α = 10% as follows:

 z = 1.645

*Use a z-table.

Compute the sample size required as follows:

Thus, the expression for the required minimum sample size is .

there is no

a. 74 degrees

step-by-step explanation:

because the lines through the side and the box in the corners shows that these are congruent triangles and since they are mirrored the 37 degrees is also mirrored so the answer is 37 * 2 which is 74.