401C - Lab 2 Solution to problem 1 1. For those of you old enough to remember, a commercial for Prell shampoo showed a pearl slowly floating down through the liquid in a bottle. Advertising aside, viscosity is an important characteristic of many products. Below are data on the viscosity of a hair conditioner. The data represent a random sample of 30 bottles from the production for that week.
Higher values indicate greater viscosity.
The mean is larger than the median, indicating the possibility that the distribution of viscosities is skewed right. 11.5 13.5 16.5 27.5 39.5 The histogram shows a mound in the -10 to 0 class and then skews to the right. The pattern in the normal probability plot is not a straight line but a curved one, rising steeply at the beginning and then leveling off. This confirms the mound at the lower values and the skewing to the right. The histogram, box plot and normal probability plot all indicate that the population distribution may be skewed right.