Use the given information to find the number of degrees of freedom, the critical values x and x, and the confidence interval estimate of o. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 90% confidence; n= 29, s = 0.21 mg. Click the icon to view the table of Chi-Square critical values. df = 28 (Type a whole number.) xf = 16.928 (Round to three decimal places as needed.) XR = 41.337 (Round to three decimal places as needed.) %D The confidence interval estimate of o is mg

Find the critical value t, for the confidence level c = 0.90 and sample size n= 15. t-Distribution Table Click the icon to view the t-distribution table. Level of t = (Round to the nearest thousandth as needed.) confidence, c One tail, a Two tails, a 0.80 0.90 0.95 0.98 0.99 0.10 0.05 0.025 0.01 0.005 d.f. 0.20 0.10 0.05 0.02 0.01 d.f. 3.078 6.314 12,706 31.821 6 965 1 63.657 1 2 1.886 2.920 4.303 6.965 9.925 3 3.182 4.541 5.841 2193 1.638 2.353 3 747 4 1.533 2.132 2.776 3.747 A.604 4 1.476 2.015 2.571 2 765 3.365 4.032 6 1.440 1.943 2.447 3.143 3.707 6. 1.415 1.895 2.365 2.998 2 400 3.499 7 8. 1,397 1.860 2.306 2.896 3.355 8. 9. 1.383 1.833 2.262 2.821 3.250 10 1.372 1.812 2.228 2.764 3.169 10 1.363 1.356 1.350 11 1.796 2.201 2.718 3.106 11 12 1.782 2.179 2.681 3.055 12 13 1.771 2,160 2.650 3.012 13 14 1.345 1.761 2,145 2.624 2.977 14 15 1.341 1.753 2.131 2.602 2.947 15

Use the given information to find the number of degrees of freedom, the critical values xf and x6, and the confidence interval estimate of o. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 98% confidence; n= 21, s = 0.26 mg. Click the icon to view the table of Chi-Square critical values. df = |(Type a whole number.)