Data for Exercises 9.10 and 9.16

Nfldraft

Format

A data frame/tibble with 29 observations on three variables

rating

rating of each player on a scale out of 10

forty

forty yard dash time (in seconds)

weight

weight of each player (in pounds)

Source

USA Today, April 20, 1994.

References

Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

Examples


plot(rating ~ forty, data = Nfldraft)

cor(Nfldraft$rating, Nfldraft$forty)
#> [1] -0.2684964
summary(lm(rating ~ forty, data = Nfldraft))
#>
#> Call:
#> lm(formula = rating ~ forty, data = Nfldraft)
#>
#> Residuals:
#>      Min       1Q   Median       3Q      Max
#> -0.97407 -0.50864 -0.00184  0.35001  1.40602
#>
#> Coefficients:
#>             Estimate Std. Error t value Pr(>|t|)
#> (Intercept)   13.744      5.291   2.598    0.015 *
#> forty         -1.466      1.012  -1.448    0.159
#> ---
#> Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
#>
#> Residual standard error: 0.6449 on 27 degrees of freedom
#> Multiple R-squared:  0.07209,	Adjusted R-squared:  0.03772
#> F-statistic: 2.098 on 1 and 27 DF,  p-value: 0.159
#>