Changes in head sizes over time suggest interbreeding with people from other regions. Use the data depicted in the accompanying dotplots and construct 95% confidence intervals to determine whether skull breadths (mm) appear to have changed from 4000 b.c. to 150 a.d. Explain your conclusion.
Answer to relevant QuestionsThe Wechsler IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of professional pilots. We want to ...You want to estimate the mean amount of annual tuition being paid by current full-time college students in the United States. First use the range rule of thumb to make a rough estimate of the standard deviation of the ...Construct the confidence interval for Exercise assuming that s is known to be 7718.8 thousand dollars. Find the confidence interval using the known value of S. Cigarettes 99% confidence; n = 25, s = 0.24 mg. Use the given information to find the number of degrees of freedom, the critical values X2L and X2R, and the confidence interval estimate of s. The samples are from Appendix B ...Highway Speefs Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, California (based on data from Sig Alert). This simple random sample was obtained at 3:30 p.m. on a weekday. Use the ...
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