A local supermarket has contracted for floor cleaning and polishing to be done each evening by a small work crew using mechanized equipment. After the crew has performed the service for several weeks and settled into a routine, the supermarket manager has timed the most recent jobs to get a better idea as to the nature of the distribution of times for performing the task.
Over the past week, the cleaning and polishing times have been 61, 44, 57, 49, 59, 43, and 42 minutes.
Using the 0.10 level of significance, apply the Kolmogorov-Smirnov test for normality in examining whether the population of cleaning times might be normally distributed.