Are geography journals worth their cost? Refer to the Geo forum (Vol. 37, 2006) study of whether the price of a geography journal is correlated with quality, presented in Exercise 2.154 (p. 90). Several quantitative variables were recorded for each in a sample of 28 geography journals: cost of a one-year subscription (dollars); journal impact factor (JIF), the average number of times articles from the journal have been cited; number of citations for the journals over the past five years; and relative price index (RPI). The data for the 28 journals are saved in the GEOJRNL file. Selected observations are listed in the next table.

a. Fit a straight-line model relating cost ( y ) to JIF ( x ). Give a practical interpretation of the estimated slope of the line.

b. Within how many dollars can you expect to predict cost?

c. Find and interpret a 95% confidence interval for the slope.

d. Repeat parts a–c for a line relating cost ( y ) to number of citations ( x ).

e. Repeat parts a–c for a line relating cost ( y ) to RPI ( x ).

Exercise 2.154

Are geography journals worth their cost? In Geoforum (Vol. 37, Nov. 2006), Simon Fraser University professor Nicholas Blomley assessed whether the price of a geography journal is correlated with quality. He collected pricing data (cost for a 1-year subscription, in U.S. dollars) for a sample of 28 geography journals. In addition to cost, three other variables were measured: journal impact factor (JIF), defined as the average number of times articles from the journal have been cited; number of citations for a journal over the past five years; and relative price index (RPI), a measure developed by economists. [ Note: A journal with an RPI less than 1.25 is considered a “good value.”] The data for the 28 geography journals are saved in the GEOJRNL file. (Selected observations are shown in the table on page 91.)

a. Construct a scatterplot for the variables JIF and cost. Do you detect a trend?

b. Construct a scatterplot for the variables number of cites and cost. Do you detect a trend?

c. Construct a scatterplot for the variables RPI and cost. Do you detect a trend?

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