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The article “Work-Related Attitudes” reports the results of a survey of 266 high school teachers and...

The article “Work-Related Attitudes” reports the results of a survey of 266 high school teachers and 395 elementary school teachers. Of the high school teachers, 126 said they are very satisfied with their jobs, whereas 224 of the elementary school teachers are very satisfied with their jobs. (a) Construct and interpret a 90% confidence interval for the true difference between the percentage of all high school teachers that are very satisfied and all elementary school teachers who are very satisfied. (b) Is there enough evidence at the 1% significance level to assert that the percentage of high school teachers that are very satisfied with their job is less than that of elementary school teachers?

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