What assumption is required in order to find said interval

Reference no: EM13933508

1. From a sample of size 20 taken from an approximately normal popula- tion it was determined that s2 = 5.36. Find a 90% confidence interval for σ .

2. A random sample of 17 high school students was selected from the senior class. It was found that the standard deviation of their summer hourly wage rates was $4.35. Find a 90% confidence interval for the true variance of the hourly wage rate for all seniors who had summer jobs. What assumption is required in order to find the said interval?

Reference no: EM13933508

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