Stats

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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asked by Helen
  1. For the question 6 (the P-value)the option 1 is wrong (i tried)

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  2. 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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    posted by Helen
  3. Problem 1 - anyone know the answer? Please explain.

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

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  5. 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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    posted by Marcov
  6. Problem 9 solved...
    I could calculate everything but do not understand problem 1...

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

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    posted by Helen
  8. 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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  9. 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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    posted by Helen
  10. 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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  11. Anyone can response to the problem 1?

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  12. Anyone know the answer to problem 10?

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    posted by OK
  13. P10
    lesson 3.3 - is identical to the second exercise

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  14. P4: 14.5%
    p5: 1.8%
    p6: 3

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    posted by Alvaro

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