Pond’s Age-Defying Complex, a cream with alpha hydroxy acid,
Pond’s Age-Defying Complex, a cream with alpha hydroxy acid, advertises that it canreduce wrinkles and improve the skin. In a study published in Archives of Dermatology(recent year), 33 middle-aged women used a cream with alpha hydroxy acid for 22weeks. At the end of the study period, a dermatologist judged whether each womanexhibited skin improvement. The results for the 33 women are listed below.
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Improved |
Improved |
No improvement |
Improved |
|
No improvement |
No improvement |
Improved |
Improved |
|
Improved |
Improved |
Improved |
Improved |
|
No improvement |
Improved |
Improved |
Improved |
|
No improvement |
Improved |
Improved |
Improved |
|
No improvement |
Improved |
No improvement |
Improved |
|
Improved |
Improved |
Improved |
Improved |
|
Improved |
No improvement |
Improved |
Improved |
|
No improvement |
|
|
|
a) MINITAB Output. Enter these data into a MINITAB worksheet all in onecolumn. Use Skin Cream as your header. Select Stat > Basic Statistics > 1-Proportion… Complete the dialog in order to obtain a 97 percent confidenceinterval.
b) Based on the 97% confidence interval for women exhibiting noimprovement, do you have sufficient evidence to conclude that the creamwill improve the skin of more than 60% of middle-aged women? Explain
