Discussion:
Q: A simple random sample of 8 employees is selected from a large firm. For the 8 employees, the number of days each was absent during the past month was found to be
1, 3, 3, 3, 1, 5, 4, and 3
(a) What is the point estimate for μ, the mean number of days absent for the firm's employees?
(b) What is the point estimate for σ2, the variance of the number of days absent?
Determine the limits of the 90% confidence interval for μ, given that
n = 86; x‾ = 60; and σ = 10.
95% CI =n1,n2) where n1=lower limit and n2=upper limit
There are 300 students enrolled in Business Statistics. Historically, exam scores are normally distributed with a standard deviation of 21.25. Your instructor randomly selected a sample of 30 examinations and finds a mean of 67.2. Determine a 90% confidence interval for the mean score for all students taking the course