Umbrella Corporation is trying to determine whether a new drug improves mood in individuals with bipolar disorder. The company gave the drug to 222 individuals (Group 1) and a placebo (or sugar pill) to a separate sample of 292 individuals (Group 2). After one month on the drug, 195 of the patients in Group 1 reported improved mood, while 167 of the patients in Group 2 reported the same.

Calculate theupper boundof a 90% confidence interval for the true difference in the proportion of individuals who experienced improved mood, to two decimal places.Take all calculations to four (4) decimal places.

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