The ignorance surveys were conducted in 2013 using random sampling methods in four different countries under the leadership of hans rosling, a swedish statistician and international health advocate. the survey questions were designed to assess the ignorance of the public to global population trends. the survey was not just designed to measure ignorance (no information), but if preconceived notions can lead to more wrong answers than would be expected by random guessing. one question asked, "in the last 20 years the proportion of the world population living in extreme poverty ", and three choices were provided: 1.)"almost doubled" 2.) "remained more or less the same" and 3.) "almost halved". of 1005 u. s. respondents, just 5% gave the correct "almost halved"1. we would like to test if the percent of correct choices is significantly different than what would be expected if the participants were just randomly guessing between the three choices.

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above