Determine the minimum sample size required when you want to be 90% confident that the sample mean is within one unit of the population mean and σ=13.8. Assume the population is normally distributed....

Determine the minimum sample size required when you want to be

90% confident that the sample mean is within one unit of the population mean and σ=13.8.

Assume the population is normally distributed. A 90% confidence level requires a sample size of enter your response here.