Effectiveness of skin cream. Pond’s Age-Defying Complex, a cream with alpha hydroxy acid, advertised that it could reduce wrinkles and improve the skin. In a study published in Archives of Dermatology (June 1996), 33 middle-aged women used a cream with alpha hydroxy acid for 22 weeks. At the end of the study period, a dermatologist judged whether each woman exhibited skin improvement. The results for the 33 women (where I = improved skin and N = no improvement) are listed in the next table. [Note: Pond’s recently discontinued the production of this cream product, replacing it with Age-Defying Towlettes.]

a. Do the data provide sufficient evidence to conclude that the cream improved the skin of more than 60% of middle-aged women? Test using a = .05.

b. Find and interpret the p-value of the test. I I N I N N I I I I I I N I I I N I I I N I N I I I I I I N I I N