Friday, April 24, 2009

April 25, 2009 - Homework I

Please complete the following questions, in your groups:

1. Section 7.1, Exercise #10, p. 343
2. Section 7.1, Exercise #38, p. 344
3. Section 7.1, Exercise #48, p. 345
4. Section 7.2, Exercise #30, p. 359
5. Section 7.3, Exercise #20, p. 371

9 comments:

  1. 10) Hо: µ < 128
    Hα: µ ≥ 128

    38) The tire mean of life would be a right-tailed test because the mean is greater than the equality.

    48) Hо: µ ≤ 21 (claim)
    Hα: µ > 21

    30) z = 1.53 There is not enough evidence at the 1% level to support the claim.

    20) t = 2.13 There is not enough evidence at the 1% level to support the claim.

    ReplyDelete
  2. Justin Kirchmeier
    Jace Wheeler
    Alex Reyes

    1. H0 u≥128, Ha u<128
    2. Right-tailed Ha u>50,000
    3. H0 u=21 Ha u≠21
    4. Reject H0 There is not enough evidence at the 5% level to support the claim
    5. Reject H0 There is not enough evidence at the 5% level to support the claim

    ReplyDelete
  3. John, Rick, Mel, Evan
    1. Section 7.1, Exercise #10, p. 343
    H0=µ ≥ 128, Ha=µ<128

    2. Section 7.1, Exercise #38, p. 344
    µ ≥ 50,000, left tail

    3. Section 7.1, Exercise #48, p. 345
    µ≤21 minutes, alternate hypotheses is µ>21

    4. Section 7.2, Exercise #30, p. 359
    The claim is false, 0.03 ≤α

    5. Section 7.3, Exercise #20, p. 371
    2.132640841 falls inside the rejection region so the claim is false.

    ReplyDelete
  4. Tonya Cox
    Rick O’Neil
    1. Ho = u ≥ 128
    Ha = u < 128 (claim)

    2. Ho: P ≥ 50,000
    Ha: P < 50,000
    There it is left tail

    3. Ho: u ≥21; Ha: u <21

    4. Ho: u≤1030
    Ha: u > 1030
    u = .05 → Zo = ±1.96

    1035 – 1030 = 5 5
    −−−−−−−−−−−−−−− −−−− ≈ 1.53
    23 3.25
    −−− = 3.25
    √50

    No Reject Ho
    Not enough eveidence

    5. Ho: u > 25 (claim)
    Ha: u ≤ 25
    u = .05 → Zo = ± 1.96

    26.2 -25 =1.2
    −−−−−− 1.2
    2.32 −−−− ≈ 2.14
    −−−− = .56 .56
    √17


    ±1.746 =To

    Reject Ho There is enough evidence to reject the claim.

    ReplyDelete
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