Stats
posted by Helen on .
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 ?

For the question 6 (the Pvalue)the option 1 is wrong (i tried)

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 
Problem 1  anyone know the answer? Please explain.

Helen how you calculate the Pvalue (problem 9)?

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.. 
Problem 9 solved...
I could calculate everything but do not understand problem 1... 
I don't understand too. Do you know any answers? except P9

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. 
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! 
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 
Anyone can response to the problem 1?

Anyone know the answer to problem 10?

P10
lesson 3.3  is identical to the second exercise 
P4: 14.5%
p5: 1.8%
p6: 3