how to determine difference vs rating how to test for difference in ra ratings which device is better why are device ratings measured on multiple item scale how to measure a device how to determine the difference between the product rating and the device rating? how do you test for ratings how to test for different ratings for two devices how to test for differences in ratings? how to measure device ratings how to test for differences in ratings for two devices where each device is rated on a multiple item scale? what is the best way to test for the device? how to evaluate the rating on an device how do you test scores for devices how to test a rating on two devices how to test the quality of ratings on a multiple item scale what statistical tool is used to test for correlation between device type and weighted grade how to determine if an individual's rating reflects the other's? do devices have an average rating on multiple item scale? do i test for differences