Answers. Chapter 9 A Puzzle Time MUSSELS. 9.1 Practice A. Technology Connection. 9.1 Start Thinking! 9.1 Warm Up. 9.1 Start Thinking!

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1 . Puzzle Time MUSSELS Technolog Connection in. Chapter 9 9. Start Thinking! For use before Activit 9. Number of shoes x Person 9. Warm Up For use before Activit Start Thinking! For use before Lesson 9. Sample answer: In general, if a scatter plot has a positive relationship, as the value of x increases so does the value of. The points lie close to a line. In general, if a scatter plot is nonlinear, the points lie in the shape of a curve. 9. Warm Up For use before Lesson 9.. a. (, ) (, ) (, ) (, ) (, ) (, ) Number sold x Sweatshirts Sold 7 x Average price b. As the average price of the sweatshirts increases, the number of sweatshirts sold decreases. 9. Practice A. positive linear relationship; As the age of the automobile increases, the odometer reading increases.. negative linear relationship; As time spent fishing increases, the amount of bait in the bucket decreases.. no relationship; The number of passengers in a car is not related to the number of traffic lights.. a. (, ), (, ), (, ), (, ) Number of surfers x Wave height b. positive linear relationship. a. about das b. about lawns c. positive linear relationship. positive linear relationship; gap between -values of to 9 7. positive linear relationship; gap between x-values of 9 to and to, outlier at (, ), clusters around and around 9. Practice B. a. (, ), (, ), ( 9, 9 ), (, ), ( 7, ),,,, ; ( ) ( ) Number of students x Minutes b. negative linear relationship. a. about bushels b. about 7 apples c. positive linear relationship. Sample answer: the number of items in a cart and the total cost Copright Big Ideas Learning, LLC A

2 . a. ard sales; ard sales b. Januar, Februar, and December c. nonlinear relationship d. Sample answer: a snow climate e. gap between -values of to 9. Enrichment and Extension. Sample answer: es; A person s hand size and foot size will usuall be proportional. As a person s foot size gets larger, so does the hand size and vice-versa.. Answer should include, but is not limited to: The student should have two measurements (one for hand size, one for foot size) for each student in the class.. Answer should include, but is not limited to: The student should have a scatter plot labeled with foot size on the x-axis and hand size on the -axis. All student data from Exercise should be correctl plotted.. Sample answer: The hpothesis from Exercise was correct. The data shows that a larger foot size indicates a larger hand size usuall.. Sample answer: about cm. Sample answer: es; This measurement is close to the approximation. Because most humans share this tpe of proportionalit, the scatter plot is a good predictor. 7. Sample answer: about cm 9. Puzzle Time SANDCRAB 9. Start Thinking! For use before Activit 9. will var. Check students graphs and predictions. 9. Warm Up For use before Activit = x +. = x + = x + 7. = x + = x. = x + 9. Start Thinking! For use before Lesson 9. B; the line best follows the trend shown b the points. There are approximatel the same number of points above and below the line. 9. Warm Up For use before Lesson 9.. Weight (ounces). Sample answer: = x +.. Sample answer:. lb 9. Practice A. a. months b. 7 lb c. Weight (pounds) d. Sample answer: =.x + 7 e. Sample answer:. lb f. positive linear relationship. a b. x Number of bananas x Age (months) Losses 7 x Week c. Sample answer: =.x + 7 d. negative linear relationship e. There are fewer losses each week.. a. no relationship b. no; Man possible lines could be drawn, but no best fit. c. no; There is no relationship, so ou are unable to predict. A Copright Big Ideas Learning, LLC

3 9. Practice B. a. $ b. fl oz c. Cost (dollars) d. Sample answer: =.x + e. Sample answer: $. f. positive linear relationship. a b. c. Sample answer: =.x + 7 d. Sample answer: % e. negative linear relationship f. Mortgage interest rates are dropping about.% per ear.. a. constant relationship b. c. = d. Everone pas $ to see the show. 9. Enrichment and Extension. 7 Cost. n = 7 9 Fluid ounces Rate (%) x Year 7x Age 7 x x.. r.9. Because r is ver close to, the data has a strong positive relationship. The scatter plot supports the conclusion because the data is ver linear and has a positive slope. 9. Puzzle Time BEEBOP 9. Start Thinking! For use before Activit Warm Up For use before Activit Start Thinking! For use before Lesson 9. will var. 9. Warm Up x x For use before Lesson Practice A. a. games Bos Girls th grade 7th grade 7 th grade x 9 9 A = B = 9 C = 9 D = F = 7 b. games c. home games were won; home games were lost; home games were plaed with an open roof; 7 home games were plaed with a closed roof. d..% Copright Big Ideas Learning, LLC A7

4 . Pet Preference. a. Hair Color Dogs Cats Total Red Blonde Brunette Black. a. Gender Texts Regularl? Male 7 Female Total 9 Age Total Yes No 7 Total Gender b. 7 classmates have red hair; classmates have blonde hair; 7 classmates have brunette hair; classmates have black hair; 9 students are female; students are male. c. Hair Color Gender Female Male 7 Red Blonde Brunette Black Female % % % % Male 7% % % % b. Texts Regularl? Age Yes 7% % 7% No % % % 9. Enrichment and Extension. a. b. c. d. Sample answer: Claire will win because the current totals are for Owen and 7 for Claire. Sample answer: About 7% of the people in the surve who are 9 ears old text regularl. c. es; People who are 9 ears old are more likel to text regularl than people who are 9 ears old. 9. Practice B. 9 cars have doors; 9 cars have doors; 79 cars have clinders; cars have clinders.. a. b. 7 students chose watching television; students chose plaing video games; students chose going online; 7 students are in th grade; 7 students are in th grade; students are in th grade. c..% 9. a. Own dog Do not own dog Own cat Do not own cat 7 b. c.. a. The missing value is. b. 7 c. 9%. 7 bos pla soccer. Pla soccer Do not pla soccer Girls Bos 7 9. Puzzle Time JUMP ROPE A Copright Big Ideas Learning, LLC

5 9. Start Thinking! For use before Activit 9. Sample answer: pictograph, bar graph, circle graph, line graph, histogram, stem-and-leaf plot, box-and-whisker plot, dot plot, scatter plot; line graphs, stem-and-leaf plots, dot plots, and scatter plots can be used to displa a list of values. Pictographs, bar graphs, and circle graphs can be used to displa information divided into categories. Line graphs and scatter plots can be used to displa the relationship between two sets of data. 9. Warm Up For use before Activit 9.. Students b Grade. th % 7th % 9. Start Thinking! For use before Lesson 9. Sample answer: Both a bar graph and a histogram have bars that represent data, but the bar graph has distinct categories and the histogram uses equal intervals. Both a line graph and a dot plot use a number line to displa data. A line graph uses line segments to show how data changes over time. A dot plot uses s to show the number of times a value occurs in a data set. Both a stem-and-leaf plot and box-and-whisker plot displa one-variable data and show the variabilit and distribution of data. A stem-and-leaf plot organizes the data numericall. A box-and-whisker plot divides the data into quarters. 9. Warm Up th 9% For use before Lesson 9. Pink % Red % Green % Favorite Color Other % Blue %. will var. Sample displas are a bar graph, a line graph, a stem-and-leaf plot, and a box-andwhisker plot. 9. Practice A. Sample answer: line graph; shows data over time. Sample answer: bar graph; shows data in categories. Sample answer: histogram; shows frequenc in intervals of same size. Sample answer: scatter plot; shows the relationship between two data sets. The break in vertical axis makes it appear that man more apples were sold.. The size of the age intervals is not the same. 7. Sample answer: scatter plot; shows a relationship between two data set. line graph 9. Sample answer: box-and-whisker plot; shows variabilit of data. Sample answer: pictograph; shows data in specific categories. Sample answer: stem-and-leaf plot; orders the data and shows the distribution 9. Practice B. Sample answer: bar graph; shows data in categories. Sample answer: histogram; shows frequenc in intervals of same size. Sample answer: scatter plot; shows the relationship between two data sets. Sample answer: circle graph; shows data as parts of a whole. It looks like equal amounts of fruit were consumed, until ou look at the ke.. Unequal spacing on the vertical axis does not show the larger number of occurrence in the older age groups. 7. Sample answer: dot plot; shows the number of times each value occurs. stem-and-leaf plot 9. Sample answer: scatter plot; shows the relationship between two data sets. Sample answer: circle graph; shows data as parts of a whole. a. A pictograph does not show the kind of precise data a Board of Directors would need. b. Sample answer: line graph 9. Enrichment and Extension. mean: $, median: $., mode: $. a. mean b. It is the highest of the three and makes it appear that the compan offers a high hourl wage to its workers. Copright Big Ideas Learning, LLC A9

6 . a. The competitor is using the mode. The newspaper is using the median. b. The competitor picked the mode because it is lowest and the want to make it look like their competitor does not offer a good hourl wage. The newspaper picked the median because it represents the data well.. median. no; The people that have been with the compan the longest will probabl have the highest pa rates of anone in the compan. 9. Puzzle Time STICK Technolog Connection. =.7x +..., or points.., or points Chapter. Start Thinking! For use before Activit. Sample answer: area and volume formulas, Pthagorean Theorem; x squared; the area of a square is the side length raised to the second power; x cubed; the volume of a cube is the edge length raised to the third power.. Warm Up For use before Activit ,... Start Thinking! For use before Lesson. will var. Check students poems.. Warm Up For use before Lesson.... ( ). Practice A... ( ) ( ) a.. a.. Practice B.. b.. ft b. mi. ( ) ( ) 9 x. ( p) 7. ( ) x a. 7 7 b..7 ft. Enrichment and Extension. An upside-down gra triangle is drawn in the middle of ever white triangle... Step White Triangles Gra Triangles 9 7. (.). x n. ( ). Each one is a power of. A Copright Big Ideas Learning, LLC