Effectiveness of skin cream. Pond’s has discontinued the production of Age-Defying Complex, a cream with LO9 alpha-hydroxy acid, with Age-Defying Towlettes. Pond’s advertised that the product could reduce wrinkles and improve the skin. In a study published in Archives of Dermatology

(June 1996), 33 middle-aged women used a product with alpha-hydroxy acid for 22 weeks. At the end of the study period, a dermatologist judged whether each woman exhibited any improvement in the condition of her skin. The results for the 33 women (where I = improved skin and N = no improvement) are listed in the accompanying table.

Can you conclude that the cream will improve the skin of more than 60% of middle-aged women?

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