Asked by Helen

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 ?

Answered by Charlotte
For the question 6 (the P-value)the option 1 is wrong (i tried)
Answered by Helen
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
Answered by Charlotte
Problem 1 - anyone know the answer? Please explain.
Answered by Charlotte
Helen how you calculate the P-value (problem 9)?
Answered by Marcov
Hello Charlotte. Helen told us a lot. If you have a 2nd account try some different from Helen's.
Unofortunately i cant have access on a second account this week..
Answered by Charlotte
Problem 9 solved...
I could calculate everything but do not understand problem 1...
Answered by Helen
I don't understand too. Do you know any answers? except P9
Answered by Charlotte
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.
Answered by Helen
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!
Answered by Charlotte
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
Answered by Charlotte
Anyone can response to the problem 1?
Answered by OK
Anyone know the answer to problem 10?
Answered by Charlotte
P10
lesson 3.3 - is identical to the second exercise
Answered by Alvaro
P4: 14.5%
p5: 1.8%
p6: 3
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