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1. The professor of statistics wants to estimate a confidence interval of 95% for some notes...

1. The professor of statistics wants to estimate a confidence interval of 95% for some notes that are normally distributed with means of 74.2 and a standard deviation of 30.9 in a group of 30 students. Determine the interval corresponding to 95%.

2. Determine the limits (lower and upper) for a confidence interval of 68.26% for μ, given n = 64 x¯ = 118 and σ = 8.

3. Which is the dependent and independent variable?

-advertising expenses

-income by sales

math   Statistics-And-Probability   
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