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8. 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 Digital Camera" data in Chapter 10_HW_Data.xls contains the battery life of 29 subcompact cameras and 16 compact cameras (data extracted from "Digital Cameras," Consumer Reports, July 2009, pp.28-29). 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. a c. Is there evidence of a difference in the variability of the battery life between the two types of digital cameras? (use a = 0.05) d. Based on the results of (c), which i test should you use to compare the mean battery life of the two types of cameras? 9. In intaglio printing, a design or figure is carved beneath the surface of hard metal or stone. Suppose that an experiment is designed to compare differences in mean surface hardness of steel plates used in intaglio printing (measured in indentation numbers), OA s] tv BB LEE BB 8. 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 Digital Camera" data in Chapter 10_HW_Data.xls contains the battery life of 29 subcompact cameras and 16 compact cameras (data extracted from "Digital Cameras," Consumer Reports, July 2009, pp.28-29). 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. a c. Is there evidence of a difference in the variability of the battery life between the two types of digital cameras? (use a = 0.05) d. Based on the results of (c), which i test should you use to compare the mean battery life of the two types of cameras? 9. In intaglio printing, a design or figure is carved beneath the surface of hard metal or stone. Suppose that an experiment is designed to compare differences in mean surface hardness of steel plates used in intaglio printing (measured in indentation numbers), OA s] tv BB LEE BB