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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Since this research focuses on sleep habits in college students and its effect on mental health, we have proposed the research question to be what the prevalence of college student's mental health issues are due to poor sleeping habits.Previous research has shown that anxiety and depression can be two indicators of poor sleep habits in college students (Becker et al., 2018). As mentioned before, college students are also at risk of developing poor sleep habits because, as freshmen, they transition into a more significant workload than they are accustomed to doing. They are also given more freedom with their time. So, we predict a relationship between mental health and low amounts of sleep-in students. In contrast, the alternative outcome is that there will be no mental health problems arising as students lose sleep for long periods. Since getting good sleep allows us to function better throughout our days, we will likely see the impact bad quality and quantity of sleep will have on…
NCI Cancer Bulletin, December 2, 2008 Volume 5 / Number 24 Title of the article: After Menopause, Weight Affects Breast Cancer Rates More than Mammography Use Women who are overweight or obese after menopause face an increased risk of breast cancer, but a large prospective cohort study indicates that the frequency of mammography use and screening accuracy are not the primary explanations for higher rates of breast cancer in these women. The same is true of large, invasive breast cancer tumors and advanced stage disease; risk increases with weight, but higher rates are not explained by the frequency or accuracy of screening mammography before breast cancer was diagnosed. The study appears in the December 3 Journal of the National Cancer Institute. Dr. Karla Kerlikowske of the San Francisco Veterans Affairs Medical Center and colleagues gathered data on 287,115 postmenopausal women who were registered in the Breast Cancer Surveillance Consortium database. Reflecting a trend in the…
Would a descriptive, correlational, independet and dependent variable, quasi-experimental or experiemental, quantitative research design be best for a research question regarding social skills training versus pharmacological treatment?
NCI Cancer Bulletin, December 2, 2008 Volume 5 / Number 24 Title of the article: After Menopause, Weight Affects Breast Cancer Rates More than Mammography Use Women who are overweight or obese after menopause face an increased risk of breast cancer, but a large prospective cohort study indicates that the frequency of mammography use and screening accuracy are not the primary explanations for higher rates of breast cancer in these women. The same is true of large, invasive breast cancer tumors and advanced stage disease; risk increases with weight, but higher rates are not explained by the frequency or accuracy of screening mammography before breast cancer was diagnosed. The study appears in the December 3 Journal of the National Cancer Institute. Dr. Karla Kerlikowske of the San Francisco Veterans Affairs Medical Center and colleagues gathered data on 287,115 postmenopausal women who were registered in the Breast Cancer Surveillance Consortium database. Reflecting a trend in the…
NCI Cancer Bulletin, December 2, 2008 Volume 5 / Number 24 Title of the article: After Menopause, Weight Affects Breast Cancer Rates More than Mammography Use Women who are overweight or obese after menopause face an increased risk of breast cancer, but a large prospective cohort study indicates that the frequency of mammography use and screening accuracy are not the primary explanations for higher rates of breast cancer in these women. The same is true of large, invasive breast cancer tumors and advanced stage disease; risk increases with weight, but higher rates are not explained by the frequency or accuracy of screening mammography before breast cancer was diagnosed. The study appears in the December 3 Journal of the National Cancer Institute. Dr. Karla Kerlikowske of the San Francisco Veterans Affairs Medical Center and colleagues gathered data on 287,115 postmenopausal women who were registered in the Breast Cancer Surveillance Consortium database. Reflecting a trend in the…
21. Causation Imagine that a team of researchers collects basic information from every student in a large high school (N=1000) and monitors the students' academic performance over a single school year. The researchers find that the students who wear glasses had significantly better grades than the students without glasses. What can we reasonably conclude from this study? Pick ONE option Wearing glasses causes students to achieve better grades The results do indicate some type of causal relationship, but we should be careful generalizing from this one high school -- the effect might not exist in the broader student population. Even if the high school was representative of the broader student population, the results do not indicate any causal link between glasses and academic performance. None of these statements offer reasonable conclusions.
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The article “Well-Fed Crickets Bowl Maidens Over” (Nature Science Update, February 11, 1999) reported that female field crickets are attracted to males with high chirp rates and hypothesized that chirp rate is related to nutritional status. The usual chirp rate for male field crickets was reported to vary around a mean of 60 chirps per second. To investigate whether the chirp rate was related to nutritional status, investigators fed 22 male crickets a high protein diet for 8 days, after which chirp rate was measured. Let: The parameter μμ be the mean chirp rateof male crickets on a high protein diet for 8 days. Given: The mean chirp rate for the random sample of crickets on the high protein diet was reported to be 65.32 chirps per second with a standard deviation of 12. Research Question: Is there convincing evidence that the mean chirp rate for crickets on a high protein diet implies an advantage in attracting the ladies? It is known that the researchers did not want to…

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