Answer:
(a)
(b)
(c) Smoking increases the time to fall asleep
Explanation:
Solving (a): The sample mean of each group
Mean is calculated as:
So, we have:
<u>Smokers</u>
and
Non Smokers
and
Solving (b): The standard deviation of each group
This is calculated as:
For smokers
So:
For non-smokers
So:
Solving (c): Impact of smoking on time to sleep
In (b), we have:
--- smokers
--- non-smokers
<em>Smokers have larger standard deviation (i.e. large variability) than non-smokers. This means that smokers require more time to fall asleep.</em>
The first one is the directory (D) I believe & the second one is .com (C)
Answer: Australia Free Trade Agreement
Explanation: