Questions from Statistics


Q: We performed a randomization test to determine whether the mean number of

We performed a randomization test to determine whether the mean number of days since an ethics professor contacted his or her mother is different from the mean number of days for a professor in a fiel...

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Q: Are students who participate in sports more extraverted than those who do

Are students who participate in sports more extraverted than those who do not? A random sample of students at a small university were asked to indicate whether they participated in sports (yes or no)...

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Q: Studies have shown that young adults experience faster weight gain and consume

Studies have shown that young adults experience faster weight gain and consume more unhealthy food than any other age group. In a 2017 study published in PLOS One, Buchanan et. al examined the effects...

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Q: In a 2016 study by Toptaş published in Academic Journals, a

In a 2016 study by ToptaÅŸ published in Academic Journals, a music educator conducted research to determine if students could successfully memorize a piano piece using only short periods of...

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Q: Figure A shows a scatterplot for the number of semesters that students

Figure A shows a scatterplot for the number of semesters that students have attended a community college and the number of credits they have accumulated. Figure B shows a residual plot of the same dat...

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Q: A student wishes to buy a used car. He finds a

A student wishes to buy a used car. He finds a consumer website that says the price of a used car is determined by its age according to the following formula: Predicted price in thousands of dollars =...

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Q: Figure A shows a scatterplot of the current salary (in thousands

Figure A shows a scatterplot of the current salary (in thousands of dollars per year) and the beginning salary for many employees at one company. Figure B shows a residual plot of the same data. Is li...

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Q: Figure A shows a scatterplot of the number of print and electronic

Figure A shows a scatterplot of the number of print and electronic holdings for a sample of large U.S. libraries. Figure B shows a QQ plot of the residuals. Is the Normality condition of the linear re...

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Q: Figure A shows a scatterplot of wages of twins for a group

Figure A shows a scatterplot of wages of twins for a group of 183 pairs of twins. Figure B shows a residual plot of the same data. Figure C shows a QQ plot of these residuals. Is the linear regression...

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Q: Figure A shows a scatterplot of some simulated data, and Figure

Figure A shows a scatterplot of some simulated data, and Figure B shows a residual plot of the same data. Is the linear regression model appropriate for these data? Why or why not? Assume the observat...

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