QUESTION 3 The sales of 12 books from Barnes&Nobles were randomly examined and the values were...

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QUESTION 3 The sales of 12 books from Barnes&Nobles were randomly examined and the values were given as follows: 244 258 256 255 252 260 240 245 Construct a 98% confidence interval for the population variance. 236 254 267 231 O [50.62, 507.91] O [55.62, 409.91] O [50.62, 409.91] O [55.87, 409.91] QUESTION 4 Choose the correct statement O Normal distribution is a family of bell-shaped and asymmetric distribution Different normal different normal distribution with different mean and standard deviation has different area under the curve within a couple of standard deviation from the mean O If several independent random variables are normally distributed, the variances of the sum is the sum of all individual variances. O The normal standard distribution is the distribution with mean as 1 and standard deviation as 1 QUESTION 3 The sales of 12 books from Barnes&Nobles were randomly examined and the values were given as follows: 244 258 256 255 252 260 240 245 Construct a 98% confidence interval for the population variance. 236 254 267 231 O [50.62, 507.91] O [55.62, 409.91] O [50.62, 409.91] O [55.87, 409.91] QUESTION 4 Choose the correct statement O Normal distribution is a family of bell-shaped and asymmetric distribution Different normal different normal distribution with different mean and standard deviation has different area under the curve within a couple of standard deviation from the mean O If several independent random variables are normally distributed, the variances of the sum is the sum of all individual variances. O The normal standard distribution is the distribution with mean as 1 and standard deviation as 1

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The detailed answer for the above question is provided below Answer 3 The confidence interval for population variance is a measure of how precise the ... View the full answer