15. (The instructions for this problem are shown after problem 14.) The Louvre Museum in Paris is interested in the relation of the age of a painting to public interest in it. The number of people stopping to look at each of 10 randomly selected paintings is observed over a week. The results are as shown:

Approximate Age (Years)

(M  268.40;???? SD  152.74)

Number of People Stopping to Look (M  88.20;???? SD  29.13)

Painting Title X ZX Y ZY The Entombment 480 1.39 68 -.69 Mystic Marriage of St. Catherine 530 1.71 71 -.59 The Bathers 255 -.09 123 1.19 The Toilette 122 -.96 112 .82 Portrait of Castiglione 391 .80 48 -1.38 Charles I of England 370 .67 84 -.14 Crispin and Scapin 155 -.75 66 -.76 Nude in the Sun 130 -.91 148 2.05 The Balcony 137 -.86 71 -.59 The Circus 114 -1.01 91 .10