An article described a study of reading speed for undergraduate and graduate students. In a sample of 12 undergraduates, the mea
n time to read a certain passage was 4.8 seconds, with a standard deviation of 1.9 seconds. In a sample of 24 Ph.D. students, the mean time was 2.8 seconds, with a standard deviation of 1.0 seconds. Let μXμX represent the population mean for undergraduates and let μYμY represent the population mean for Ph.D. students. Find a 95% confidence interval for the difference μX−μYμX−μY. Round down the degrees of freedom to the nearest integer and round the answers to three decimal places.
Cost of a canoe is $12 and call number of days rented two mountain bikes are $18 and call number of days rented. That sum has to be < $138 (it should be less than or equal to $138, but that isn't a choice).12c+18m<$138C.