10.11 Digital cameras have taken over the majority of the point-and-shoot camera market. One of the important features of a camera ...

     10.11 Digital cameras   have taken over the majority of the point-and-shoot camera market. One of the   important features of a camera is the battery life as measured by the number   of shots taken until the battery needs to be recharged. The data in the file Digitalcameras   contain the battery life of 31 subcompact cameras and 15 compact cameras   (data extracted from “Cameras,” Consumer Reports, November 2006, pp. 20–21).   a. Assuming that the population variances from both types of digital cameras   are equal, is there evidence of a difference in the mean battery life between   the two types of digital cameras (a=0.05)? b. Determine the p-value in (a)   and interpret its meaning. DIGITAL CAMERAS Battery Life Camera Type   Subcompact Compact 320 Subcompact 320 520 520 Subcompact 520 260 160   Subcompact 160 400 160 Subcompact 160 200 300 Subcompact 300 300 120   Subcompact 120 150 520 Subcompact 520 360 440 Subcompact 440 200 300   Subcompact 300 260 170 Subcompact 170 80 150 Subcompact 150 200 300   Subcompact 300 260 180 Subcompact 180 400 100 Subcompact 100 260 150 S   ubcompact 150 200 400 Subcompact 400 170 Subcompact 170 180 Subcompact 180   160 Subcompact 160 240 Subcompact 240 320 Subcompact 320 260 Subcompact 260   150 Subcompact 150 320 Subcompact 320 180 Subcompact 180 140 Subcompact 140   220 Subcompact 220 160 Subcompact 160 340 Subcompact 340 200 Subcompact 200   130 Subcompact 130 520 Compact 260 Compact 400 Compact 200 Compact 300   Compact 150 Compact 360 Compact 200 Compact 260 Compact 80 Compact 200   Compact 260 Compact 400 Compact 260 Compact 200 Compact