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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN: 9780079039897
Author: Carter
Publisher: McGraw Hill
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A 99.8% confidence interval for the mean number of letter sounds identified in one minute is…

Transcribed Image Text: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 132 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 23.19.
Part: 0/ 2
Part 1 of 2
(a) Construct a 99.8% confidence interval for the mean number of letter sounds identified in one minute. Round the
answers to at least two decimal places.
A 99.8% confidence interval for the mean number of letter sounds identified in one minute Is
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