Creating confidence interval to estimate sigma

Reference no: EM1317244

Q1) Given below are actual high temperatures and high temperatures which were predicted one day earlier. Using 5% significance level, is there statistically enough evidence to support claim that forecast temperatures were above actual high temperatures, therefore giving evidence that weatherman is consistently wrong in her forecast? Carry out suitable hypothesis test showing essential statistical evidence to support your final given conclusion.

Actual High	Predicted High
80	78
77	74
81	79
85	85
73	68

We are also interested in evaluating population standard deviation, sigma (σ). We will again suppose that selling prices are close to being normally distributed. selling prices from sixteen PDA's are given below.

250	249	255	199	240	228	255	232
246	210	225	246	240	245	225	246

Out to right, create a 90% confidence interval estimate of sigma (σ), population standard deviation.

Reference no: EM1317244

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