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# To study the effect of soothing music on a persons blood pressure, two random samples of 220 adults ...

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To study the effect of soothing music on a person’s blood pressure, two random samples of 220 adults were taken. One sample (sample 1) listened to soothing music for 5 min prior to having their blood pressure taken, while the other sample (sample 2) sat in silence. From previous studies, it was found that both populations have a standard deviation of 39.18. The average systolic blood pressure from the music sample was 114.5. The average systolic blood pressure from the silent sample was 122.8. Construct a 98% confidence interval on the difference in population mean blood pressures (music – silent).

(–14.4448, –2.1552)

(–17.9223, 1.3222)

(–16.9903, 0.3903

(–15.6219, -0.9781)

Textbook

## Introductory Statistics: A Problem-Solving Approach

Edition: 3rd
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