Friday, May 1, 2009

May 2, 2009 - Homework, Chapter 8

Complete the following 4 questions in your work groups and post as a team. *** I realize these questions are extremely difficult - and to that end, Dustin is in the LRC (Stats help) and you are encouraged to work with him for additional help. I am also distributing PowerPoint notes to help.

Complete the following exercises from your textbook
Elementary Statistics—Picturing the World:

1. Section 8.1, Exercise #4, p. 409
2. Section 8.1, Exercise #18, p. 411
3. Section 8.2, Exercise #14, p. 421
4. Section 8.2, Exercise #20, p. 422
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7 comments:

  1. BryanMay 2, 2009 at 10:44 AM

    Posted By: Bryan S., Nick N.
    4) a. -10
    b. -38.5
    c. Z is in the rejection region.
    d. Reject Ho. There is enough evidence at the 5% level to reject the claim.

    18) a. -440
    b. -6.3
    c. Z is not in the rejection region.
    d. Fail to reject Ho. There is not enough evidence at the 5% level to reject the claim.

    14) There is no need to run the test because this is a right-tailed test and the test statistic is negative. It is obvious that the standardized test statistic will also be negative and fall outside of the rejeciton region. So, the decision is to fail to reject Ho.

    ReplyDelete
  2. rickMay 2, 2009 at 11:19 AM

    Rick Robinson, John, Mel, Evan

    1. Section 8.1, Exercise #4, p. 409
    Sqrt((30/100)+(15/75)) =0.707106781
    10/0.707106781 =14.142135627

    z = 14.14, which is in the rejection region
    therefore the alternate hypothesis is true

    ReplyDelete
  3. AnonymousMay 9, 2009 at 8:51 AM

    Tonya Cox
    Rick O’neil

    Have Emailed to you cause some of the equations won't post

    ReplyDelete
  4. rickMay 9, 2009 at 10:33 AM

    Rick Robinson, John Drake, Mel Bailey

    1. Section 8.1, Exercise #4, p. 409
    Sqrt(((30^2)/100)+((15^2)/75))= 3.464101615
    -10/ 3.464101615 =-2.886751346
    z = -2.886751346, which is not in the rejection region
    therefore the null hypothesis is true

    2. Section 8.1, Exercise #18, p. 411
    -440 52900/40+1322.5
    z=-6.26497193
    answer – no the results don't change.

    3. Section 8.2, Exercise #14, p. 421
    z=-4.032258065
    H0 is true

    4. Section 8.2, Exercise #20, p. 422
    z= .272
    H0 = true
    Ha = false
    therefore the claim is false

    ReplyDelete
  5. BryanMay 9, 2009 at 10:47 AM

    Posted By: Bryan S., & Nick N.

    20). a. Ho: u1=u2
    b. 33
    c. 0.2728
    d. Do not reject, there is not enough evidence to support.

    ReplyDelete
  6. UnknownMay 9, 2009 at 11:03 AM

    Scott Phillips
    1. P.409 #4
    a. -10
    b. -2.89
    c. Not in the reject region
    d. Do not reject the null hypothesis, not enough evidence.
    2. P.411 #18
    a. H0:µ1≤µ2
    HA:µ1>µ2
    b. Z0=1.96
    c. -6.26
    d. No they do not lead to a different conclusion; it is not in the rejection region.
    3. P.421 #14
    a. -5
    b. -4.03
    c. Does not fall in the rejection region.
    d. Not enough evidence to reject.
    4. P422 #20
    a. Ha:µ1≠µ2
    b. d.f. = 33
    c. t=.2729
    d. Do not reject null, not enough evidence.

    ReplyDelete
  7. SheilaMay 9, 2009 at 11:15 AM

    Shiela W Karolyn M

    4) a. -10
    b. -38.5
    c. Z is not in the rejection region.
    d. do not reject Ho.

    18)a. Ho:m1 greater or equall to m2
    Ho:m1 less than m2
    b. Zo = 1.96
    c. 70.23
    d. Fail to reject the null, insufficient eveidence is not in the rejection region

    14)a. -5
    b. -4.03
    c. does not fall in rejection region
    d. not enough evidence to reject

    20)20). a. Ho: u1=u2
    b. 33
    c. 0.2728
    d. Do not reject, there is not enough evidence to support

    ReplyDelete

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