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Suppose that 14 individuals take a two-day course that is supposed to improve their knowledge of Web page design, which is rated as "not proficient," "proficient," or "advanced proficient." Of the 14 individuals in the sample, 12 are rated higher after the course than before, 1 individual is rated lower, and 1 individual's assessment is unchanged. Using a significance level of 0.05, can we conclude from this information that the course is successful in improving individuals' knowledge of Web page design?

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