This course is designed to offer students the skills necessary to interpret and critically
evaluate statistics commonly used to describe, predict and evaluate data in an
information-driven environment. The focus is on the conceptual understanding of how
statistics can be used and on how to evaluate statistical data.
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
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
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10) Hо: µ < 128
ReplyDeleteHα: 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.
Justin Kirchmeier
ReplyDeleteJace 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
John, Rick, Mel, Evan
ReplyDelete1. 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.
Tonya Cox
ReplyDeleteRick 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.
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