28. Crawling babies, outliers. A study conducted at the University of Denver investigated whether babies take longer to learn to crawl in cold months, when they are often bundled in clothes that restrict their movement, than in warmer months. The plot below shows the relationship between average crawling age of babies born in each month and the average temperature in the month when the babies are six months old. The plot reveals a potential outlying month when the average temperature is about 53F and average crawling age is about 28.5 weeks. Does this point have high leverage? Is it an influential point?96 (Benson 1993) 34 =4 Average crawling age (weeks) 50 30 32 30 30 40 40 50 Temperature (F) 60 70 24. Cats weights. The following regression output is for predicting the heart weight (Hwt, in g) of cats from their body weight (Bwt, in kg). The coefficients are estimated using a dataset of 144 domestic cats. 94 term (Intercept) Bwt 20 20 Heart weight (g) 5 10 2.0 estimate std.error statistic p.value -0.357 0.692 -0.515 0.6072 4.034 0.250 16.119