Calculate the 80% confidence interval for the same fictional data regarding daily TV viewing habits: μ = 4.7 hours; σ = 1.3 hours; sample of 78 people with mean of 4.1 hours.

The relevant formula for estimating the confidence interval is indicated below.
Confidence Interval = Sample Mean +/- z*Standard Deviation/√Sample size
Here, sample mean = 4.1 hour
Sample size = 78
Relevant z value for 80% confidence interval = 1.28
Standard deviation of population = 1.3...