A researcher investigates whether there is a relationship between vocabulary size and performance on a reading comprehension test. Each of 15 sixth-grade students is given both a vocabulary test and a reading comprehension test (both tests are scored in terms of percentage correct). The results for the 15 schoolchildren are (with vocabulary scores given first): 44,67; 24,33; 67,45; 75,54; 34,45; 88,79; 57,67; 44,32; 87,95; 77,67; 87,78; 54,67; 90,78; 36,55; 79,91. Draw a scatterplot and calculate a correlation coefficient for these data.