A new teaching method was implemented at an elementary school. A survey of the s

Question

A new teaching method was implemented at an elementary school. A survey of the student's attitudes toward math was given before and 2 months after the new method was implemented. The scores on the survey can be analyzed using a matched samples analysis. Answer choices a through d represent 80%, 90%, 95% and 99% confidence intervals for the mean difference in attitude scores. The confidence intervals are presented in random order. Based on your knowledge of confidence intervals, which answer represents the 95% confidence interval? 2.43 to 3.17 2.51 to 3.09 2.19 to 3.41 2.35 to 3.25

Explanation / Answer

Bigger the confidence interval wider is the range of interval, therefore taking difference between the upper and lower limit and arranging in descending order we get,

99% = 2.19 to 3.41

95% = 2.35 to 3.25

90% = 2.43 to 3.17

80% = 2.51 to 3.09

Therefore the confidence interval which represents 95% Confidence interval = 2.35 to 3.25

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