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Doss [256]
3 years ago
13

A factory can work its employees no more than 5 days a week, and no less than 2 days per

Mathematics
1 answer:
azamat3 years ago
3 0

Answer:

2 ≤ x ≤ 5

Step-by-step explanation:

If x = number of days worked

According to the question:

Employees cannot work for more than 5 days per week: that is maximum working days per week is 5 - - - (1)

x ≤ 5 - - - (1)

Employees cannot work for less Than 2 days per week, that is minimum working days per week is 2 days

x ≥ 2 - - - (2)

Combining both conditions (1) and (2) such that the both Inequality sign are the same :

If x ≥ 2 ; then 2 ≤ x

Combining 2 ≤ x and x ≤ 5

We have ;

2 days ≤ x ≤ 5 days

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Answer:

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8 0
3 years ago
A clinical trial was conducted to test the effectiveness of the drug zopiclone for treating insomnia in older subjects. Before t
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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.

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Step-by-step explanation:

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