1. A researcher is studying the effect a new drug into on blood pressure. The researcher measures the blood pressure of 30 participants before and after they take the drug and calculates the mean difference in blood pressure to be -5 mm Hg. The standard deviation of the differences is 8 mm Hg. (a) Using p-test, determine if the change in blood pressure is statistically significant. (b) The researcher has determined that the sample standard deviation cannot be assumed as σ, perform the same test but now using a t-test.

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Q: Q10.5

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