Posted by Helen on Saturday, August 3, 2013 at 6:25am.
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 46.
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 Pvalue of the test is closest to _______%, so the null hypothesis is rejected.
1 or 2 or 3 or 4 ?

Stats  Charlotte, Monday, August 5, 2013 at 1:43pm
For the question 6 (the Pvalue)the option 1 is wrong (i tried)

Stats  Helen, Monday, August 5, 2013 at 1:51pm
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

Stats  Charlotte, Monday, August 5, 2013 at 2:39pm
Problem 1  anyone know the answer? Please explain.

Stats  Charlotte, Monday, August 5, 2013 at 2:56pm
Helen how you calculate the Pvalue (problem 9)?

Stats  Marcov, Monday, August 5, 2013 at 2:59pm
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..

Stats  Charlotte, Monday, August 5, 2013 at 3:06pm
Problem 9 solved...
I could calculate everything but do not understand problem 1...

Stats  Helen, Monday, August 5, 2013 at 4:01pm
I don't understand too. Do you know any answers? except P9

Stats  Charlotte, Monday, August 5, 2013 at 4:55pm
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.

Stats  Helen, Monday, August 5, 2013 at 6:13pm
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!

Stats  Charlotte, Tuesday, August 6, 2013 at 5:04am
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 tcurve to obtain the pvalue.
For this question you need to have answered correctly questions 3 and 4
P6
just understand the significance of Pvalue and how do the conclusion

Stats  Charlotte, Tuesday, August 6, 2013 at 8:14am
Anyone can response to the problem 1?

Stats  OK, Tuesday, August 6, 2013 at 8:28am
Anyone know the answer to problem 10?

Stats  Charlotte, Tuesday, August 6, 2013 at 8:34am
P10
lesson 3.3  is identical to the second exercise

Stats  Alvaro, Friday, August 9, 2013 at 5:16am
P4: 14.5%
p5: 1.8%
p6: 3
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