Suppose that, on average, U.S. adults get fast food 14 times a week. In a random sample of 41 people, it was found that they ordered fast food an average of 15 times in one week. Assume the population standard deviation is 4.3 . Perform a test at a significance level of \( 4 \% \) to determine whether or not the number of times a U.S. adult gets fast food in a week is different from 14.

3. Box and Whisker Plot: Draw a box and whisker plot for the data provided and identify any outliers. \( 12,17,13,14,12,16,18,29,15,14,12,17,13,14,12,16,18,29,15,14,12,17,13 \), \( 14,12,16,18,29,15,14 \)

20. Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To test this claim, a researcher selects a sample of \( n=25 \) college students. Each student is given a ginkgo biloba supplement daily for 6 weeks and then all of the participants are given a standardized memory test. Scores on the normalized test are \( \mu=70 \) and standard deviation of 15 . The sample of 25 students had a mean score of \( M=75 \). (8 points) a. Do the data indicate a significant effect of the herb on memory? Use a two-tailed test with \( \alpha=0.05 \). (Show all steps.)

3. Box and Whisker Plot: Draw a box and whisker plot for the data provided and identify any outliers. \( 12,17,13,14,12,16,18,29,15,14,12,17,13,14,12,16,18,29,15,14,12,17,13 \), \[ 14,12,16,18,29,15,14 \]

De una muestra aleatoria de 1.203 estudiantes de contaduría de cierto año, el \( 20,2 \% \) afirı que la oferta laboral era muy mal pagada. De una muestra aleatoria de 1.203 estudian de empresariales en otro año posterior, el \( 13,2 \% \) compartían dicha opinión. Calcule un tervalo de confianza del \( 99 \% \) para la diferencia entre las proporciones poblacionales.

g) Of the " \( r \) " values below which would be reasonable for the scatterplot above? Explai your reasoning. \( r=-.94 \quad r=-.32 \quad r=.32 \quad r=.94 \)