OMIS 41q2

Question 1 of 19

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For 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

Select one of the following:

  • Ho: m = 150 H1: m ≠ 150

  • Ho: m = 150 H1: m > 150

  • Ho: m < 150 H1: m > 150

  • Ho: m > 150 H1: m = 150

Question 2 of 19

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Thirty percent of California teenagers drop out of school

Select one of the following:

  • Ho: P ≠ .30 H1: P = .30

  • Ho: P = .30 H1: P > .30

  • Ho: m = .30 H1: m ≠ .30

  • Ho: P = .30 H1: P ≠ .30

Question 3 of 19

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The variance in daily commute time on the Bay Bridge is less than 100 minutes2

Select one of the following:

  • Ho: m = 100 H1: m < 100

  • Ho: σ = 100 H1: σ ≠ 100

  • Ho: σ = 100 H1: σ < 100

  • Ho: m = 100 H1: m ≠ 100

  • none of these answers

Question 4 of 19

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Suppose 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

Select one of the following:

  • Ho: X-bar = 25 H1: X-bar ≠ 25

  • Ho: m = 25 H1: m > 25

  • Ho: X-bar = 25 H1: X-bar > 25

  • Ho: m = 25 H1: m ≠ 25

Question 5 of 19

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What is the value of Zcalc

Select one of the following:

  • 1.84

  • 1.96

  • 0.63

  • 7.80

Question 6 of 19

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What is the value of Zcrit, given a 5% level of significance

Select one of the following:

  • ±1.96

  • 1.645

  • none of these answers

  • 1.96

Question 7 of 19

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What is the p-value

Select one of the following:

  • .058

  • .050

  • .967

  • .033

Question 8 of 19

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What is the conclusion of the hypothesis test

Select one of the following:

  • Do not reject the null since p-value < α

  • Reject the null since Zcalc > Zcrit

  • Do not reject the null since Zcalc > -Zcrit

  • Reject the null since p-value > α

Question 9 of 19

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We 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

Select one of the following:

  • 30.15

  • 21.3

  • 29.7

  • 25.0

Question 10 of 19

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What is the calculated value of β

Select one of the following:

  • .21

  • .15

  • .42

  • .04

Question 11 of 19

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Using 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%

Select one of the following:

  • none of these answers

  • -2.10

  • 2.61

  • -2.61

Question 12 of 19

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Ho: m = 12 and H1: m > 12, n = 21, α = 9%

Select one of the following:

  • 1.39

  • 2.23

  • 2.19

  • 1.78

Question 13 of 19

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Ho: m = 5 and H1: m ¹ 5, n = 50, α = 9%

Select one of the following:

  • -1.73, 1.73

  • -2.02, 2.02

  • -1.30, 1.30

  • none of these answers

Question 14 of 19

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Joan'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

Select one of the following:

  • (1.88, 2.52)

  • (1.76, 2.64)

  • (1.83, 2.57)

  • (1.97, 2.43)

Question 15 of 19

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How do you interpret the above confidence interval

Select one of the following:

  • we are 95% confident that 5% of the values of the sample means will result in a confidence interval that includes the population mean

  • if 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

  • we are 95% confident that we have selected a sample whose range of values does not contain the population mean

  • 95% of the data will fall within the confidence interval

Question 16 of 19

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We want to perform a hypothesis test to determine if the mean tree planting time differs from two hours.

Formulate the null and alternative hypotheses

Select one of the following:

  • Ho: m = 2 H1: m < 2

  • Ho: X-bar = 2 H1: X-bar ≠ 2

  • Ho: m = 2 H1: m ≠ 2

  • Ho: m < 2 H1: m ≠ 2

Question 17 of 19

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At the 10% significance level, what is the critical value of the test statistic

Select one of the following:

  • -1.645, 1.645

  • -1.96, 1.96

  • -2.262, 2.262

  • -1.833, 1.833

Question 18 of 19

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What is the calculated value of the test statistic

Select one of the following:

  • 1.23

  • 2.35

  • 1.36

  • 2.06

Question 19 of 19

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What is the conclusion of the hypothesis test

Select one of the following:

  • Do not reject the null since tcalc < tcrit

  • Accept the null since tcalc < tcri

  • Do not reject the null since Zcalc < Zcrit

  • Reject the null since Zcalc > Zcrit

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hsherwood02
Quiz by , created almost 3 years ago

OMIS Quiz on OMIS 41q2, created by hsherwood02 on 08/02/2014.

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Created by hsherwood02 almost 3 years ago
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