A company hires a consulting firm to conduct a seminar to improve workers€™ sense of self-esteem. Employees are given a test to assess their self-esteem before the seminar, and again afterwards. The test scores are shown below in Exhibit 9.50. A higher score indicates higher self-esteem.

a. What kind of data are these?
b. Is there sufficient evidence, at a 5% significance level, to suggest that the seminar improved employees' self-esteem?

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Self-Esteem Test Score Before Seminar 70 84 74 61 82 Self-Esteem Test Score After Seminar 76 89 69 65 59 40 63 80 43 56 84 67 63 76 61 82 57 83 56 47 85 90