Chapter 4: Q. 4 (page 192)
In Problems 3-5, answer true or false to each statement. Explain your answers.
4. A horizontal line has no slope.
Short Answer
It is incorrect to say that a horizontal line has no slope.
Chapter 4: Q. 4 (page 192)
In Problems 3-5, answer true or false to each statement. Explain your answers.
4. A horizontal line has no slope.
It is incorrect to say that a horizontal line has no slope.
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Get started for freeWhat can you say aboutSSE, SSR and the utility of the regression equation for making predictions if
a.
b.
Age and Price of Orions. In Table , we provided data on age and price for a sample of Orions between and years old. On the Weiss Stats site, we have given the ages and prices for a sample of Orions between and years old.
a. Obtain a scatterplot for the data.
b. Is it reasonable to find a regression line for the data? Explain your answer.
Wasp Mating Systems. In the paper "Mating System and Sex Allocation in the Gregarious Parasitoid Cotesia glomerata" (Animal Behaviour, Vol. , pp. ). H. Gu and S. Dorn reported on various aspects of the mating system and sex allocation strategy of the wasp C. glomerata, One part of the study involved the investigation of the percentage of male wasps dispersing before mating in relation to the brood sex ratio (proportion of males). The data obtained by the researchers are on the WeissStats site.
a. Obtain a scatterplot for the data.
b. Is it reasonable to find a regression line for the data? Explain your answer.
Tax Efficiency. In Exercise 4.58, you determined a regression equation that relates the variables percentage of investments in energy securities and tax efficiency for mutual fund portfolios.
a. Should that regression equation be used to predict the tax efficiency of a mutual fund portfolio with of its investments in energy securities? with of its investments in energy securities? Explain your answers.
b. For which percentages of investments in energy securities is use of the regression equation to predict tax efficiency reasonable?
6. What kind of plot is useful for deciding whether finding a regression line for a set of data points is reasonable?
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