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A cheerleading squad received a mean rating (out of 100 possible points) of
70 ± 9 (μ ± σ)
in competitions over the previous three seasons. The same cheerleading squad performed in 16 local competitions this season with a mean rating equal to 72 in competitions. Suppose we conduct a one-independent sample z-test to determine whether mean ratings increased this season (compared to the previous three seasons) at a 0.05 level of significance.
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