An educational psychologist wants to test whether a new teaching method negatively affects reading comprehension scores using
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Question:
An educational psychologist wants to test whether a new teaching method negatively affects reading comprehension scores using a significance level of 0.05. A sample of 51 students taught with the new method has a mean reading comprehension score of 68.1. The population of all students taught using the old method has a mean reading comprehension score of 68.8 and a standard deviation of 4.8. Assume scores are distributed normally. How wide is the 95% Confidence Interval (i.e., upper limit - lower limit) for the mean reading comprehension scores of students taught using the new method? Enter value with three decimals.
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