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Amanda387 Amanda387
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2 years ago
Problem 1:
A report states that on average Moroccan boys (12-18 years old) get a haircut 5.8 times a year. An independent researcher randomly selected 20 boys (12-18 years old) and obtained these data.
3   2   1   3   7   2   9   4   6   6
8   0   5   6   4   2   1   3   4   1

At α = 0.05, can it be concluded that the average is still 5.8 visits per year? (Hint: use the t test for hypothesis testing)

Problem 2:
A large university reports that the mean salary of parents of an entering class is $91,600. To see how this compares to his university, a president surveys 28 randomly selected families and finds that their average income is $88,500. If the sample standard deviation is $10,000, can the president conclude that there is a difference? At α = 0.10, is he correct?
(Hint: hypothesis testing when the mean is known/ z table)

Because of these circumstances, I decided to give you a light final exam. Get back to me if you need any help
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bio_manbio_man
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Educator
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2 years ago
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A report states that on average Moroccan boys (12-18 years old) get a haircut 5.8 times a year. An independent researcher randomly selected 20 boys (12-18 years old) and obtained these data. 3   2   1   3   7   2   9   4   6   6 8   0   5   6   4   2   1   3   4   1 At α = 0.05, can it be concluded that the average is still 5.8 visits per year? (Hint: use the t test for hypothesis testing)

Been a while since I've done this, so take my interpretation with a grain of salt





Also an amazing video explaining it all!


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wrote...
Educator
2 years ago
Because of these circumstances, I decided to give you a light final exam. Get back to me if you need any help

What do you mean by that?
wrote...
Educator
2 years ago
Problem 2: A large university reports that the mean salary of parents of an entering class is $91,600. To see how this compares to his university, a president surveys 28 randomly selected families and finds that their average income is $88,500. If the sample standard deviation is $10,000, can the president conclude that there is a difference? At α = 0.10, is he correct? (Hint: hypothesis testing when the mean is known/ z table)

Check this out:

wrote...
On Hiatus
2 years ago
thank youu
wrote...
Educator
2 years ago
Let me know what you get for problem 2. I can confirm that problem 1 is correct, I looked my solution over, it checks out.
wrote...
On Hiatus
2 years ago
I still don't understand the solution of problem 1
wrote...
Educator
2 years ago
I still don't understand the solution of problem 1

Which part? Did you watch the video that came with it?
wrote...
On Hiatus
2 years ago
yes i did but i found it difficult
wrote...
Educator
2 years ago
Watch it several times over, its been explained really well.

In terms of the solution I provided above, which part doesn't make sense to you?
wrote...
Educator
2 years ago
Answer to question 2:



wrote...
On Hiatus
2 years ago
now i understand thank you
wrote...
2 years ago
thank you
wrote...
Educator
2 years ago
thank you

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