Answer:

Step-by-step explanation:

Null hypothesis: u = 39.8

Alternative: u =/ 39.8

Using a one sample z test: the formula is

z = x-u / (sd/√n)

Where x = 33.1 u = 39.8, sd= 16.2 and n = 38

Thus we have:

z = 33.1-39.8 / (16.2/√38)

z = -6.7 / (16.2/6.1644)

z = -6.7/ 2.6280

z= -2.5495

To be able to arrive at a conclusion, we have to find the p value, the p value at a 0.1 significance level for a two tailed test is 0.0108. This is way less than 0.1 thus we will reject the null and conclude that there has been a change (either way) in the average number of e-mails received per day per employee. Yes, the new policy had an effect.

Alaska

Main

Oregon

Colorado

Arizona

Florida

Hawaii

Cali

**Answer:**

He would have a total of 20 inches of snow on his lawn

**Step-by-step explanation:**

**2.5 x 4 = 10**

**10 + 10 = 20**

**Answer:**

383.13

**Step-by-step explanation:**

<span>A rectangular prism has four lateral surfaces. If the sides of the base are L and W, two of the lateral surfaces are rectangles of side L and H, and the other two are rectangles of sides W and H. Then, the lateral area is the sum of the areas of the four lateral rectangles: 2 * L * H + 2 * W * H= 10 * 4 = 2 * 10 * 4 + 2 * 5 * 4 = 2*40 + 2 * 20 = 80 + 40 = 120.</span>