Pop. mean = 88.96
Pop. std. dev. = 68.38
Sample size = 30
Sample mean = 89.58
Sample std. dev. = 19.88

suppose that you are part of select marketing group. This select group has been enquired to consider Colorado City Convention and Visitors Bureau survey of 25 hotels in local area. Survey is concerned with current availability of rooms. Availability of rooms was as follows: 90, 72, 75, 60, 75, 72, 84, 72, 88, 74, 105, 115, 68, 74, 80, 64, 414, 82, 48, 58, 60, 80, 48, 58, and 108. Each person in marketing group should choose the sample of 10 hotels from the list.

Consider average available for all hotel rooms from previous assignment. Recognize point estimate of average number of available hotel rooms in this lesson from each sample. Create and Interpret 95% confidence level for true mean number of available hotel rooms, based on point estimate of each sample. Explain how confidence intervals will change depending on whether population standard deviation is known or unknown.