Answer:
Following are the answer to this question:
Step-by-step explanation:
Given:
n = 30 is the sample size.
The mean = 7.3 days.
The standard deviation = 6.2 days.
df = n-1
The importance level is = 0.10
The table value is calculated with a function excel 2010:
The method for calculating the trust interval of 90 percent for the true population means is:
Formula:
It can rest assured that the true people needs that middle managers are unavailable from 5,37 to 9,23 during the years.