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

137

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 was34.06

with a standard deviation of23.64

.

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Construct a

95

%

interval for the mean number of letter sounds identified in one minute. Round the answers to two decimal places.A95

%

confidence interval for the mean number of letter sounds identified in one minute is

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