Quiz
OMIS 41q2
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Perguntas do quiz (19)
1For each of the following three statements, formulate the correct null and alternative hypotheses
The average weight for Santa Clara freshman men is more than 150 pounds- AHo: m = 150 H1: m ≠ 150
- BHo: m = 150 H1: m > 150
- CHo: m < 150 H1: m > 150
- DHo: m > 150 H1: m = 150
2Thirty percent of California teenagers drop out of school
- AHo: P ≠ .30 H1: P = .30
- BHo: P = .30 H1: P > .30
- CHo: m = .30 H1: m ≠ .30
- DHo: P = .30 H1: P ≠ .30
3The variance in daily commute time on the Bay Bridge is less than 100 minutes2
- AHo: m = 100 H1: m < 100
- BHo: σ = 100 H1: σ ≠ 100
- CHo: σ = 100 H1: σ < 100
- DHo: m = 100 H1: m ≠ 100
- Enone of these answers
4Suppose that 18 observations are drawn from a normal population whose standard deviation is 12. Given a sample mean of 30.2, answer the following seven questions
Formulate the null and alternative hypotheses to test whether or not the population mean is greater than 25- AHo: X-bar = 25 H1: X-bar ≠ 25
- BHo: m = 25 H1: m > 25
- CHo: X-bar = 25 H1: X-bar > 25
- DHo: m = 25 H1: m ≠ 25
5What is the value of Zcalc
- A1.84
- B1.96
- C0.63
- D7.80
6What is the value of Zcrit, given a 5% level of significance
- A±1.96
- B1.645
- Cnone of these answers
- D1.96
7What is the p-value
- A.058
- B.050
- C.967
- D.033
8What is the conclusion of the hypothesis test
- ADo not reject the null since p-value < α
- BReject the null since Zcalc > Zcrit
- CDo not reject the null since Zcalc > -Zcrit
- DReject the null since p-value > α
9We want to calculate the probability of a Type II error for this problem given a new μ = 32.
What is the calculated value of X-barcrit- A30.15
- B21.3
- C29.7
- D25.0
10What is the calculated value of β
- A.21
- B.15
- C.42
- D.04
11Using Excel, find the critical value(s) for the Student's t-test for the following three hypothesis tests, where n is the sample size and alpha is the significance level (Hint: Watch your signs and be careful with the number of tails)
Ho: m = 3 and H1: m < 3, n = 7, α = 4%- Anone of these answers
- B-2.10
- C2.61
- D-2.61
12Ho: m = 12 and H1: m > 12, n = 21, α = 9%
- A1.39
- B2.23
- C2.19
- D1.78
13Ho: m = 5 and H1: m ¹ 5, n = 50, α = 9%
- A-1.73, 1.73
- B -2.02, 2.02
- C-1.30, 1.30
- Dnone of these answers
14Joan's nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a particular landscaping proposal is based on the number of plantings of trees, shrubs and so on to be used for the project. For cost estimating purposes, managers use two hours of labor time for the planting of medium sized trees. Actual times from a sample of ten plantings during the past month are as follows: 1.7, 1.5, 2.6, 2.2, 2.4, 2.3, 2.6, 3.0, 1.4, 2.3. Assume that the population is normally distributed. Answer the following six questions
Based on this sample, what is the 95% confidence interval for the true mean tree planting time- A(1.88, 2.52)
- B(1.76, 2.64)
- C(1.83, 2.57)
- D (1.97, 2.43)
15How do you interpret the above confidence interval
- Awe are 95% confident that 5% of the values of the sample means will result in a confidence interval that includes the population mean
- Bif we repeatedly draw samples of the same size from the same population, 95% of the intervals we create in this fashion will capture the true population mean
- C we are 95% confident that we have selected a sample whose range of values does not contain the population mean
- D 95% of the data will fall within the confidence interval
16We want to perform a hypothesis test to determine if the mean tree planting time differs from two hours.
Formulate the null and alternative hypotheses- AHo: m = 2 H1: m < 2
- BHo: X-bar = 2 H1: X-bar ≠ 2
- CHo: m = 2 H1: m ≠ 2
- D Ho: m < 2 H1: m ≠ 2
17At the 10% significance level, what is the critical value of the test statistic
- A-1.645, 1.645
- B -1.96, 1.96
- C-2.262, 2.262
- D-1.833, 1.833
18What is the calculated value of the test statistic
- A1.23
- B2.35
- C1.36
- D2.06
19What is the conclusion of the hypothesis test
- ADo not reject the null since tcalc < tcrit
- BAccept the null since tcalc < tcri
- CDo not reject the null since Zcalc < Zcrit
- D Reject the null since Zcalc > Zcrit
Informações
- Descrição
- OMIS Quiz sobre OMIS 41q2, criado por hsherwood02 em 08-02-2014.
- Autor
- hsherwood02
- Idioma
- English
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- 136
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