A company sent seven of its employees to attend a course in building self-confidence. These employees were
Question:
a. Construct a 95% confidence interval for the mean µd of the population paired differences, where a paired difference is equal to the score of an employee before attending the course minus the score of the same employee after attending the course.
b. Test at a 1% significance level whether attending this course increases the mean score of employees.
Assume that the population of paired differences has a normal distribution.
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