Case 1: Machine Maintenance A cereal company wants to make sure the machine used to fill boxes of cereal is working t-Test: One-Sample properly. The machine is supposed to fill each box with 18 ounces of cereal. To test the nachine's accuracy, you sampled the weight of 40 boxes of cereal. To determine if the nachine needs maintenance, you conduct a one-sample t-test (see results in K2:M7). If the werage wei ght statistically differs from 18 ounces, you will order a maintenance repair. But because the repair can be costly and because there are potential punitive costs for not selling ood products at the advertised weight, you want to be 95% confident in the results. Mean (weight) 18.4 Variance 0.9 Observations 40 t-stati stic 2.67 P(t= T) two-tail 0.011 23 Questions 1 What is the sample size? According to the case, what should be the Hypothesized Mean (M)? Enter a numeric value. 2 3 What is the null hypothesis (Ho) of this test? [select)

Case 1: Machine Maintenance A cereal company wants to make sure the machine used to fill boxes of cereal is working t-Test: One-Sample properly. The machine is supposed to fill each box with 18 ounces of cereal. To test the nachine's accuracy, you sampled the weight of 40 boxes of cereal. To determine if the nachine needs maintenance, you conduct a one-sample t-test (see results in K2:M7). If the werage wei ght statistically differs from 18 ounces, you will order a maintenance repair. But because the repair can be costly and because there are potential punitive costs for not selling ood products at the advertised weight, you want to be 95% confident in the results. Mean (weight) 18.4 Variance 0.9 Observations 40 t-stati stic 2.67 P(t= T) two-tail 0.011 23 Questions 1 What is the sample size? According to the case, what should be the Hypothesized Mean (M)? Enter a numeric value. 2 3 What is the null hypothesis (Ho) of this test? [select)

Name: Case 1: Machine MaintenanceA cereal company wants to make sure the ma
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Description: Case 1: Machine MaintenanceA cereal company wants to make sure the machine used to fill boxes of cereal is workingt-Test: One-SampleMean (weight)properly. The machine is supposed to fill each box with 18 ounces of cereal. To test the18.4machine's ac

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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We are trying whether, a new low fat diet actually helps obese people lose weight. 100 randomly obese people are assigned to group 1 and put on a low fat-diet. another 100 people are assigned to group 2 and put on a diet of approximately the same amount of food, but not as low in fat. After 4 months, the mean net weight loss was 9.31 pounds for group 1 with a standard deviation of 4.67 pounds, and for group 2 the mean net weight loss was 7.40 pounds with a standard deviation of 4.04 pounds. Is the low-fat diet more effective? Perform a hypothesis test at the 5% significance level a) Define Parameters and state null and alternative hypothesis b) Find test statistics c) Find p-value d) Conclusion
Scenario: 200 people were asked, “Who is your favorite superhero?” Below are the data. Test the null hypothesis that the population frequencies for each category are equal. α= .05. Iron Man Black Panther Wonder Woman Spiderman fo = 40 fo = 60 fo =55 fo = 45 fe = fe = fe = fe = What is the correct result based on the data?
Phosphorous is a chemical that is found in many household cleaning products. Unfortunately, phosphorous also finds its way into surface water, where it can harm fish, plants, and other wildlife. Two methods of phosphorous reduction are being studied. At a random sample of 7 locations, both methods were used and the total phosphorous reduction (mg/L) was recorded. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value a small amount and thereby produce a slightly more "conservative" answer. Things that are labelled i underneath a b c, etc are all part of that part.
Suppose the Humane Society claims that 30% of U.S. households own cats. You believe your community is different than the U.S. percentage. To test the claim, you take a simple random sample of 300 households and find that 37% own cats. Test at 5% significance. Round to the fourthH0H0:Select an answer x̄ p̂ μ p Correct Select an answer = < > ≠ Correct CorrectHAHA:Select an answer x̄ p̂ μ p Correct Select an answer = < > ≠ Correct CorrectWhat's the minimum population size required? IncorrectHow many successes were there? CorrectTest Statistic: CorrectP-value: CorrectDid something significant happen? Select an answer Significance Happened Nothing Significant Happened Correct Select the Decision Rule: Select an answer Reject the Null Accept the Null Fail to Reject the Null Correct There Select an answer is is not Correct enough evidence to conclude find the minimum population size required.
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Phosphorous is a chemical that is found in many household cleaning products. Unfortunately, phosphorous also finds its way into surface water, where it can harm fish, plants, and other wildlife. Two methods of phosphorous reduction are being studied. At a random sample of 7 locations, both methods were used and the total phosphorous reduction (mg/L) was recorded. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value a small amount and thereby produce a slightly more "conservative" answer. Site 1 2 3 4 5 6 7 Method I: 0.013 0.020 0.015 0.055 0.007 0.002 0.010 Method II: 0.014 0.045 0.017 0.039 0.017 0.001 0.013 Do these data indicate a difference (either way) in the average reduction of phosphorous between the two methods? Use α = 0.05. (Let d = Method I − Method II.) (i) What is the level of significance? What is the value of the sample test statistic? (Round…
Determine u- and o; from the given parameters of the population and sample size. H%=55, 0=6, n = 40 %3D