# Question

The National Oceanic and Atmospheric Administration publishes temperature information of cities around the world in Climates of the World. A random sample of 50 cities gave the data on average high and low temperatures in January shown on the WeissStats CD.

a. Obtain a scatterplot for the data.

b. Decide whether finding a regression line for the data is reasonable. If so, then also do parts (c)–(f).

c. Determine and interpret the regression equation for the data.

d. Identify potential outliers and influential observations.

e. In case a potential outlier is present, remove it and discuss the effect.

f. In case a potential influential observation is present, remove it and discuss the effect.

a. Obtain a scatterplot for the data.

b. Decide whether finding a regression line for the data is reasonable. If so, then also do parts (c)–(f).

c. Determine and interpret the regression equation for the data.

d. Identify potential outliers and influential observations.

e. In case a potential outlier is present, remove it and discuss the effect.

f. In case a potential influential observation is present, remove it and discuss the effect.

## Answer to relevant Questions

Polychlorinated biphenyls (PCBs), industrial pollutants, are known to be a great danger to natural ecosystems. In a study by R. W. Risebrough titled "Effects of Environmental Pollutants Upon Animals Other Than Man" ...Exercise 4.47. a. Use Equation (4.1) to determine the sample covariance. b. Use Equation (4.2) and your answer from part (a) to find the regression equation. Compare your result to that found in the specified exercise. A ...y-bar = 2 + x a. Compute the three sums of squares, SST, SSR, and SSE, using the defining formulas (page 164). b. Verify the regression identity, SST = SSR + SSE. c. Compute the coefficient of determination. d. Determine the ...y = 68.22 + 0.25x (from Exercise 4.5) a. Find the y-intercept and slope of the specified linear equation. b. Explain what the y-intercept and slope represent in terms of the graph of the equation. c. Explain what the ...The data from Exercise 4.69 for average high and low temperatures in January for a random sample of 50 cities are on the WeissStats CD. a. Decide whether finding a regression line for the data is reasonable. If so, then also ...Post your question

0