Area of a rectangle is the product of length times width. Thus, here we need the product of 8 1/2 inches by 11 inches.

One way of doing this follows: 8.5
8.5
----------
93.5 square inches

Rounding up, this comes out to 94 square inches.

Alternatively: 17 187
---- * 11 = ------- = 93.5 square inches; rounded, that's 94.
2 2

3 0

3 years ago

Type A, type B, and type C lightbulbs are lasting longer today than ever before. On average, the number of bulb hours for a t

777dan777 [17]

Amge that’s is the answers

7 0

3 years ago

Write an expression describing her earnings for working hours

Licemer1 [7]

Answer:

you need to explain what the question is

Step-by-step explanation:

4 0

2 years ago

A clinical trial was conducted to test the effectiveness of the drug zopiclone for treating insomnia in older subjects. Before t

aleksklad [387]

Answer:

We cannot say that the mean wake time are different before and after the treatment, with 98% certainty. So the zopiclone doesn't appear to be effective.

Step-by-step explanation:

The goal of this analysis is to determine if the mean wake time before the treatment is statistically significant. The question informed us the mean wake time before and after the treatment, the number of subjects and the standard deviation of the sample after treatment. So using the formula, we can calculate the confidence interval as following:

$IC[\mu ; 98\%] = \overline{y} \pm t_{0.99,n-1}\sqrt{\frac{Var(y)}{n}}$

Knowing that $t_{0.99,15} = 2.602$ :

$IC[\mu ; 98\%] = 98.9 \pm 2.602\frac{42.3}{4} \Rightarrow 98.9 \pm 27.516$

$IC[\mu ; 98\%] = [71.387 ; 126,416]$

Note that $102.8 \in [71.384 ; 126.416]$ so we cannot say, with 98% confidence, that the mean wake time before treatment is different than the mean wake time after treatment. So the zopiclone doesn't appear to be effective.

7 0

3 years ago