Question

The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 18 22 40 High Income 20 15 35 Total 38 37 75 Based on this data: (give your answers to parts a-c as fractions, or decimals to at least 4 decimal places. Give your answer to part d as a whole number.) a) The proportion of all children that drew the nickel too small is: .5067 Correct .5067 Assume that this proportion is true for ALL children (e.g. that this proportion applies to any group of children), and that the remainder of the questions in this section apply to selections from the population of ALL children. b) If 6 children are chosen, the probability that exactly 3 would draw the nickel too small is: .3123 Correct c) If 6 children are chosen at random, the probability that at least one would draw the nickel too small is: .9856 Correct .9856 d) If 110 children are chosen at random, it would be unusual if Incorrect or more drew the nickel too small. (Assume unusual is more than 2 SD from the mean.)

Answer 1