Suppose we are interested in studying the relationshipbetween the shelf life of cheeses in a dairy factory and thethickness of the packaging material used for those cheeses.We would like to determine if there is a causal relationshipbetween the thickness of the packaging material and theshelf life of the cheese; that is, does a change in thethickness of the packaging material cause a change in theshelf life of the cheese?Select the study that would be best source of evidence forestablishing the existence of a causal relationship.Select one:O a. A study which uses a stratified random sample,stratifying by type of cheese, to select units of cheesein the factory and determine the thickness of thepackaging material and test the shelf life of each unit.O b. A study which uses a cluster sample, clustering byroom the cheese is stored in, to select units ofcheese in the factory and determine the thickness ofthe packaging material and test the shelf life of eachunit.O c. A study in which a regression model y = Bo + B1T isestimated from a simple random sample of cheesesfrom the dairy factory with packaging materialthickness (æ) and measured shelf lives (y) and allnecessary assumptions are verified to testH, : B1 = 0 against HA : B1 + 0.O d. A study which randomly assigns units of cheese to bepackaged with packaging materials of differingthicknesses and then measures the shelf life.

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Answered: Suppose we are interested in studying…

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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A significant interaction was found between depression, social support and GPA. These results should be considered with caution and further research should be done to better understand the relationships between these variables. Furthermore, those working with college students should consider the overall well-being of the student, as it is possible that their academic performance may not be affected by anxiety and/or depression. IS THIS A TYPE 1 ERROR OR A TYPE 2 ERROR IN RESEARCH?
Fish of Lake Laengelmaevesi. An article by J. Puranen of the Department of Statistics, University of Helsinki, discussed a classic study on several variables of seven different species of fish caught in Lake Laengelmaevesi, Finland. On theWeissStats site, we present the data on weight (in grams) and length (in centimeters) from the nose to the beginning of the tail for four of the seven species. Perform the required parts for both the weight and length data. a. Obtain individual normal probability plots and the standard deviations of the samples. b. Perform a residual analysis. c. Use your results from parts (a) and (b) to decide whether conducting a one-way ANOVA test on the data is reasonable. If so, also do parts (d) and (e). d. Use a one-way ANOVA test to decide, at the 5% significance level, whether the data provide sufficient evidence to conclude that a difference exists among the means of the populations from which the samples were taken. e. Interpret your results from part (d)
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