Questions 2.5-2.16, show work

530 CHAPTER 7 SAMPLING DISTRIBUTIONS digits = incorrect. Ten digits from the table simulate 10 answers . Chapter 7 Cumulative Ap Practice Test 2 - 531 (a) 404 (c) One digit from the random digit table simulates one (b) 411 answer, with odd = correct and even = incorrect. Ten (c) 418 b) For each 1% increase in the graduation rate, the AP2.13 The country with a literacy rate of 4% is closest to digits from the table simulate 10 answers. which of the following percentiles? (d) 425 percent of families living in poverty is predicted to (d) One digit from the random digit table simulates decrease by approximately 0.802. (a) 6th (e ) 448 one answer, with 0 or 1 = correct and all other (c) For each 1% increase in the graduation rate, the digits = incorrect, ignoring repeats. Ten digits from the percent of families living in poverty is predicted to (b) 1 1th AP2.8 You work for an advertising agency that is preparing decrease by approximately 0.620. (c) 28th table simulate 10 answers. a new television commercial to appeal to women. d) For each 1% increase in the percent of families living (d) 49th (e) Two digits from the random digit table simulate You have been asked to design an experiment to in poverty, the graduation rate is predicted to decrease (e) There is not enough information to calculate the one answer, with 00 to 20 = correct and 21 to compare the effectiveness of three versions of the by approximately 0.802, percentile. 99 = incorrect. Ten pairs of digits from the table commercial. Each subject will be shown one of the (e) For each 1% increase in the percent of families living AP2.14 The correlation between the age and height simulate 10 answers. three versions and then asked to reveal her attitude in poverty, the graduation rate is predicted to decrease of children under the age of 12 is found to be toward the product. You think there may be large by approximately 0.620. = 0.60. Suppose we use the age x of a child to AP2.5 Suppose we roll a fair die four times. What is the differences in the responses of women who are predict the height y of the child. What can we probability that a 6 occurs on exactly one of the employed and those who are not Because of these Questions AP2. 11-AP2.13 refer to the following graph. Here rolls? differences, you should use a dotplot of the adult literacy rates in 177 countries in a conclude? (a) a block design, but not a matched pairs design. recent year, according to the United Nations. For example, (a) The height is generally 60% of a child's age. (2) 43) b) About 60% of the time, age will accurately predict (b) a completely randomized design. the lowest literacy rate was 23.6%, in the African coun- try of Burkina Faso. Mali had the next lowest literacy rate height. (c) a matched pairs design. 1 24.0%. c) Thirty-six percent of the variation in height is (d) a simple random sample. accounted for by the linear model relating height to (e) a stratified random sample. age. d) For every 1 year older a child is, the regression line AP2.9 Suppose that you have torn a tendon and are facing predicts an increase of 0.6 foot in height. surgery to repair it. The orthopedic surgeon explains e) Thirty-six percent of the time, the least-squares the risks to you. Infection occurs in 3%% of such oper. regression line accurately predicts height ations, the repair fails in 14%, and both infection rom age. and failure occur together 1% of the time. What's the probability that the operation is successful for AP2.15 An agronomist wants to test three different types of someone who has an operation that is free from fertilizer (A, B, and C) on the yield of a new vari- infection? 80 100 ety of wheat. The yield will be measured in bush- AP2.6 On one episode of his show, a radio show host Literacy rate (% ) els per acre. Six I-acre plots of land were randomly encouraged his listeners to visit his website and vote ( a ) 0.8342 assigned to each of the three fertilizers. The treat- in a poll about proposed tax increases. Of the 4821 (b) 0.8400 AP2.11 The overall shape of this distribution is ment, experimental unit, and response variable people who vote, 4277 are against the proposed (c) 0.8600 (a) clearly skewed to the right. are, respectively, increases. To which of the following populations (d) 0.8660 (b) clearly skewed to the left. (a) a specific fertilizer, bushels per acre, a plot of land. should the results of this poll be generalized? (e) 0.9900 (b) variety of wheat, bushels per acre, a specific fertilizer. (a) All people who have ever listened to this show (c) roughly symmetric. (c) variety of wheat, a plot of land, wheat yield. AP2.10 Social scientists are interested in the association (d) approximately uniform (b) All people who listened to this episode of the show between high school graduation rate (HSCR, me ) There is no clear shape. (d) a specific fertilizer, a plot of land, wheat yield. (c) All people who visited the show host's website sured as a percent) and the percent of U.S. fam (e) a specific fertilizer, the agronomist, wheat yield. (d) All people who voted in the poll lies living in poverty (POV). Data were collected AP2.12 The mean of this distribution (don't try to find it) will be AP2.16 According to the U.S. Census, the proportion of (e) All people who voted against the proposed increases from all 50 states and the District of Columba (2) very close to the median. adults in a certain county who owned their own and a regression analysis was conducted The home was 0.71. An SRS of 100 adults in a certain AP2.7 The number of unbroken charcoal briquets in a resulting least-squares regression line is given by by greater than the median. section of the county found that 65 owned their 20-pound bag filled at the factory follows a Normal POV = 59.2 - 0.620(HSGR) with r = 0802 (c) less than the median. home. Which one of the following represents the distribution with a mean of 450 briquets and a stan- Based on the information, which of the following (d) You can't say, because the distribution isn't approximate probability of obtaining a sample of dard deviation of 20 briquets. The company expects is the best interpretation for the slope of the least symmetric, 100 adults in which 65 or fewer own their home, that a certain number of the bags will be underfilled, quares regression line? You can't say, because the distribution isn't assuming that this section of the county has the so the company will replace for free the 5% of bags a) For each 1% increase in the graduation rate, the Normal. same overall proportion of adults who own their that have too few briquets. What is the minimum percent of families living in poverty is predicted to home as does the entire county? number of unbroken briquets the bag would have to decrease by approximately 0.896. contain for the company to avoid having to replace the bag for free