Kava is a beverage or extract that is made from Piper methysticum, a plant native to the western Pacific islands. Suppose tha in a randomized comparative experiment to determine if taking kava daily can reduce insomnia, a group of participants with insomnia were randomly assigned to take kava (treatment group) or a placebo (control group). After six weeks, the participants were interviewed to see if they experienced a decrease in insomnia. The table shows the results from the sample The counts are the number of people in each group who experienced a decrease in insomnia. Population Group Description Sample size Sample count Sample proportion proportion 1 Treatment (kava) n¡ = 402 X1 = 213 PI = 0.5299 P1 2 Control (placebo) P2 n2 = 521 x2 = 121 P2 = 0.2322 Compute the standard error estimate, SE, of the difference in the sample proportions. Give your answer to at least four decimal places. 0.0438 SE = Incorrect Determine the value of the two-sample z-statistic for the difference in the two proportions, pi – P2. Give your answer to at least four decimals places. 7.8417 z =

Kava is a beverage or extract that is made from Piper methysticum, a plant native to the western Pacific islands. Suppose tha in a randomized comparative experiment to determine if taking kava daily can reduce insomnia, a group of participants with insomnia were randomly assigned to take kava (treatment group) or a placebo (control group). After six weeks, the participants were interviewed to see if they experienced a decrease in insomnia. The table shows the results from the sample The counts are the number of people in each group who experienced a decrease in insomnia. Population Group Description Sample size Sample count Sample proportion proportion 1 Treatment (kava) n¡ = 402 X1 = 213 PI = 0.5299 P1 2 Control (placebo) P2 n2 = 521 x2 = 121 P2 = 0.2322 Compute the standard error estimate, SE, of the difference in the sample proportions. Give your answer to at least four decimal places. 0.0438 SE = Incorrect Determine the value of the two-sample z-statistic for the difference in the two proportions, pi – P2. Give your answer to at least four decimals places. 7.8417 z =

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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