The trend of thinner beauty pageant winners has generated charges that the contest encourages unhealthy diet habits among young women. Listed below are body mass indexes (BMI) for beauty pageant winners from two different time periods. Find the coefficient of variation for each of the two sets of data, then compare the variation. BMI (from the 1920s and 1930s) BMI (from recent winners) 20.4 19.6 219 20.4 22.1 19.7 22.2 20.3 17.9 17.9 20.3 188 18.9 19.2 19.4 18.7 18.4 17.7 19.1 16.8 The coefficient of variation for the BMI's of beauty pageant winners from the 1920s and 1930s is %

A food bank investigates if the number of times their donors walk by a homeless person each week impacts donors’ charitable contribution to the food bank. The data are presented below in standard form.     # of homeless people seen each week Donation to food bank Donor ZX ZY 1 -1.3 0.36 2 0.64 -0.09 3 -1.1 1.26 4 -0.14 0.14 5 1.41 -0.54 6 -0.52 -0.09 7 1.03 -1.9 8 0.64 -0.99 9 0.83 0.36 10 -1.49 1.49   What does ΣZXZY equal? A) 941B) 7.86C) -7.16D) -4.44       What is the correlation (Pearson’s r) between the number of homeless people donors see each week and their donation to the food bank (rounded to 2 decimal places)?  A) .98B) -.80C) .72D) -.56     What is the obtained t-value for this r? A) -2.96B) -16.35C) -3.72D) -1.89     What are the degrees of freedom?  A) 4B) 20C) 8D) 10      What is the critical t-value?  A) 3.68B) 2.31C) 2.01D) 3.30     What is your conclusion?  A) There is…

Listed below are pulse rates (beats per minute) from samples of adult males and females. Find the mean and median for each of the two samples and then compare the two sets of results. Does there appear to be a difference? 86 Male: 73 90 52 57 64 63 55 97 64 95 54 93 61 60 Female: 68 88 93 90 79 65 85 62 91 92 73 90 78 82 75 D C Find the means. The mean for males is beats per minute and the mean for females is beats per minute. (Type integers or decimals rounded to one decimal place as needed.)

State whether the following Scatter plot has: 1- Positive correlation 2- Negative correlation 3 No correlation Next Question