Arecent study compared the time spent together by single- and dual-earner couples. according to the records kept by the wives during the study, the mean amount of time spent together watching television among the single-earner couples was 61 minutes per day, with a standard deviation of 15.5 minutes. for the dual-earner couples, the mean number of minutes spent watching television was 48.4 minutes, with a standard deviation of 18.1 minutes. at the 0.01 significance level, can we conclude that the single-earner couples on average spend more time watching television together?