Q 18 Sound it out: Phonics is an instructional method in which children are taug
ID: 3431885 • Letter: Q
Question
Q 18
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 133 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 34.21 with a standard deviation of 23.33. Part 1 out of 2 Construct a 99.9% confidence interval for the mean number of letter sounds identified in one minute. Round the answers to two decimal places. [ ]Explanation / Answer
Margin of error = 6.66
Lower bound for conf interval at 99.9% = 34.21-6.66 = 24.75
Upper bound for conf interval at 99.9% = 34.21+6.66 = 41.87
conf interval 99.9% = (24.75, 41.87)
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.