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(a) The article “Nonbloated Burned Clay Aggregate Concrete” (J. Materials,1972: 555-563) reports the following data on 7-day flexural strength of nonbloated burned clay aggregate concrete samples (psi):,227 299 291 276 316 318 323 338 361 374 373 385 401 403 432 427 442 411 456 448 466 472 470 492 496 508 517 548 570 726 746 766 786 806 816 831,Test at a significance level of 5% to decide if flexural strength can be considered to be normally distributed. Use the appropriate Goodness of Fit test.,(b) The article “Measuring the Exposure of Infants to Tobacco Smoke” (N. Engl. J. Med., 1964: 1075-1078) reports on a study in which various measurements were taken both from a random sample of infants who had been exposed to household smoke and from a sample of unexposed infants. The accompanying data consists of observations on urinary concentration of cotanine, a major metabolite of nicotine. Does the data suggest that true average cotanine level is higher in exposed infants than in unexposed infants by more than 25?,Cary out a test at a significance level of 5%.,,Unexposed: 8 11 12 14 20 43 111,,Exposed: 35 56 83 92 128 150 176 208,,You can’t assume normality, so use the appropriate nonparametric test. ,,,

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