It is assumed that the mean systolic blood pressure is u 120 mm Hg. In the Honolulu Heart Study, a sample of n100 people had an average systolic blood pressure of 130.1 mm Hg with a standard deviation of 21.21 mm Hg, Is there reason to belleve that the average systolic blood pressure is equal to 120 mm Hg at 5% lovel of significance? Assume the systolic blood pressure is normally distributed with unknown population variance.

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