For a study on a new cold medicine, a group of 100 participants with cold symptoms was studied for one month in the spring. one-fifth of the participants were given the cold medicine, and the rest of the participants were given a placebo, a pill that has no active ingredients. of the participants that were given the medicine, 70% felt improvement of their symptoms. of the participants that were given the placebo, 80% felt improvement of their symptoms. what is the probability of randomly choosing a participant who took the placebo, given they did not feel improvement?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Do social recommendations increase ad effectiveness? a study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. data were collected on whether the viewer could correctly recall the brand being advertised after seeing the video. the results are given below.correctly recalled the brandarrival 409153browsing20484b. conduct the hypothesis test, using the 0.025 level of significance.what is the value of the test statistic? χ2stat=what is the p-value? p-value=is this value significant atα=0.025?

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?