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Sound it out: Phonics is an instructional method in which children are taught to connect sounds with letters or groups of letters. A sample of 145 first-graders who were learning English were asked to identify as many letter sounds as possible in a period of one minute. The average number of letter sounds identified was 34.13 with a standard deviation of 23.95.Part: 0/2Part 1 of 2 (a) Construct a 99% confidence interval for the mean number of letter sounds identified in one minute. Round the answers to two decimal places.A 99% confidence interval for the mean number of letter sounds identified in one minute is $