Answer 2.11-2.15Show work

Chapter 7 Cumulative AP Practice Test 2 531 by For each I's increase in the graduation rate, the percent of families living in poverty is predicted to decrease by approximately 0.802. AP2.13 The country with a literacy rate of 49%% is closest to which of the following percentiles? For each 14 increase in the graduation rate, the (a) 6th percent of families living in poverty is predicted to decrease by approximately 0.620. (b) 11th (c) 28th d) For each 1%% increase in the percent of families living in poverty, the graduation rate is predicted to decrease (d) 49th by approximately 0.802. (e) There is not enough information to calculate the For each 1% increase in the percent of families living percentile. in poverty, the graduation rate is predicted to decrease by approximately 0.620. AP2.14 The correlation between the age and height of children under the age of 12 is found to be Questions AP2.11-AP2.13 refer to the following graph. Here = 0.60. Suppose we use the age x of a child to is a dotplot of the adult literacy rates in 177 countries in a predict the height y of the child. What can we conclude? recent year, according to the United Nations. For example, the lowest literacy rate was 23.6%, in the African coun- (a) The height is generally 60% of a child's age. try of Burkina Faso. Mali had the next lowest literacy rate (b) About 60%% of the time, age will accurately predict height. at 24.0%%. (c) Thirty-six percent of the variation in height is accounted for by the linear model relating height to age. (d) For every 1 year older a child is, the regression line .. ............... predicts an increase of 0.6 foot in height (e) Thirty-six percent of the time, the least-squares regression line accurately predicts height from age. AP2.15 An agronomist wants to test three different types of fertilizer (A, B, and C) on the yield of a new vari- 100 ety of wheat. The yield will be measured in bush- Literacy rate (%) els per acre. Six I-acre plots of land were randomly assigned to each of the three fertilizers. The treat- AP2.11 The overall shape of this distribution is ment, experimental unit, and response variable are, respectively, (a) clearly skewed to the right. (a) a specific fertilizer, bushels per acre, a plot of land. (b) clearly skewed to the left. (b) variety of wheat, bushels per acre, a specific fertilizer. (c) roughly symmetric. (c) variety of wheat, a plot of land, wheat yield. (d) approximately uniform. (d) a specific fertilizer, a plot of land, wheat yield. (e) There is no clear shape. (e) a specific fertilizer, the agronomist, wheat yield. AP2.12 The mean of this distribution (don't try to find it) AP2.16 According to the U.S. Census, the proportion of will be adults in a certain county who owned their own (a) very close to the median. home was 0.71. An SRS of 100 adults in a certain (b) greater than the median. section of the county found that 65 owned their home. Which one of the following represents the (c) less than the median. approximate probability of obtaining a sample of (d) You can't say, because the distribution isn't 100 adults in which 65 or fewer own their home, symmetric. assuming that this section of the county has the (e) You can't say, because the distribution isn't same overall proportion of adults who own their Normal. home as does the entire county