# Stats

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In a simple random sample of 1000 people taken from City A, 13% are senior citizens. In an independent simple random sample of 600 people taken from City B, 17% are senior citizens. Is the percent of senior citizens different in the two cities? Or is this just chance variation?

Answer in the steps described in Problems 4-6.

4) Under the null hypothesis, the percent of senior citizens in each of the two cities is estimated to be ________ %.

13 or 13.5 or 14 or 14.5 or 15 or 15.5 or 16 or 16.5 or 17 or 17.5 ?

5) Under the null hypothesis, the estimated standard error of the difference between the percents of senior citizens in the two samples is closest to _________%

1 or 1.2 or 1.4 or 1.6 or 1.8 or 2 ?

6) The P-value of the test is closest to _______%, so the null hypothesis is rejected.

1 or 2 or 3 or 4 ?

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For the question 6 (the P-value)the option 1 is wrong (i tried)

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the correct is 3.

In P10 the 1st one is wrong.

P2: 1 wrong
P4: -2,1 and -2,3 wrong
P5: 1 and 2,5 % wrong
P9: 1 and 1,2 wrong

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Helen how you calculate the P-value (problem 9)?

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Hello Charlotte. Helen told us a lot. I f you have a 2nd account try some different from Helen's.
Unofortunately i cant have access on a second account this week..

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Problem 9 solved...
I could calculate everything but do not understand problem 1...

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I don't understand too. Do you know any answers? except P9

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P7
Calculate Pooled Estimated of p (p^)-lesson 3.4

P8
Calculate the two SE (SE(A) SE(B)) and then the SE final - see lesson 3.4

Try to do the calculates... If you can not do i explain.

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Oh i found them thank you..

I am truing P5 and P4. I really want to learn what is the answer of P4. Basically I tried 2 times I have no more submissions.

I was doing a typo. Later i concluded in -2.6 but I cant learn if is correct!

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P4
Lesson 3.2 - Attention to the explanation how we calculate the SD (beginning of the lesson); Attention to what is said in parenthesis in the enunciated.
-2.6 is not correct

P5
Use the t-curve to obtain the p-value.
For this question you need to have answered correctly questions 3 and 4

P6
just understand the significance of P-value and how do the conclusion

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Anyone can response to the problem 1?

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Anyone know the answer to problem 10?

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P10
lesson 3.3 - is identical to the second exercise

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P4: 14.5%
p5: 1.8%
p6: 3

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