Ten students were chosen at random from our class and the grade and attendance is listed below. Attendance is the percent that work was turned in on time and the grade is the grade in the class except the final. Attendance        Grade 94                        100 49                        60 87                        80 100                      95 52                        40 75                        66 100                      95 65                        61 89                        70 98                        93   The trend line is Y=0.918 x+1.7355____________________ and R2 is _0.8237____________   If a student plugs the value 80 in the trendline for x, write a sentence explaining the 80 and what the answer means.

The scatter plot shows the relationship between the number of minutes studying for a test (x) and the number of mistakes made (y). The graph shows the scatterplot of the data and a fitted line. 19+ 18 17 16 15 14 13 12 10 4 -10 10 20 30 40 50 60 70 80 90 100 lio a2 Select True or False for each statement based on the scatter plot. True/False There is a negative association between the amount of time studying for a test and the number of mistakes made. True False Students who studied for a longer period of time tended to make more mistakes. True False There is a linear association between time True False studying and number of mistakes.

Identify the reasons the following statements are incorrect. Not all reasons will be used. Researchers found that the correlation between the number of pages in novels and Correlation should depend on units. the number of hours it takes to read them is r = 0.71 pages. The correlation between the advertised selling price of cars and the makes of the Both variables should be numerical. cars is r = -0.69. The amount of ice cream in a sundae and the total grams of fat are highly Correlation should depend on units. correlated (r = 1.15). The correlation between total daily snowfall in inches and daily low temperatures Both variables should be numerical. in degrees Fahrenheit differs from the correlation between daily snowfall in inches and daily low temperatures in degrees Celsius. Answer Bank One of the variables should be categorical. Correlation should not depend on units. Correlation should depend on units. Correlation should be greater than 0. Both variables should be numerical.…

Match the coefficient of determination to the scatter diagram. The scales on the x-axis and y-axis are the same for each scatter diagram. (a) R? = 0.12, (b) R2 = 0.98, (c) R? = 0.58 (a) Scatter diagram Eplantory (b) Scatter diagram (e) Scatter diagram Esplanatory II Eplanatory

Can a low barometer reading be used to predict maximum wind speed of an approaching tropical cyclone? For a random sample of tropical cyclones, let x be the lowest pressure (in millibars) as a cyclone approaches, and let y be the maximum wind speed (in miles per hour) of the cyclone. x 1004 975 992 935 989 928 y 40 100 65 145 80 147   (a) Make a scatter diagram of the data and visualize the line you think best fits the data.   (b) Would you say the correlation is low, moderate, or strong? low moderate     strong   Would you say the correlation is positive or negative? positive negative       (c) Use a calculator to verify that          x = 5823,          x2 = 5,656,235,          y = 577,          y2 = 64,859  and          xy = 553,251   Compute r. (Round your answer to four decimal places.)     As x increases, does the value of r imply that y should tend to increase or decrease? Explain your answer. Given our value of r, y…

Match the linear correlation coefficient to the scatter diagram. The scales on the x- and y-axes are the same for each diagram. (a) r = -1 (b) r= -0.933 (c) r=-0.523 (d) r= -0.038 Click the icon to view the scatter diagrams. r= -0.933 r= -1 r= -0.523 r=-0.038 Drag each of the r-values given above into the appropriate area below. Q Response Explanatory Response Explanatory Q *** Response Explanatory Q Response Explanatory

Fireworks and Injuries These data were obtained for the years 1993 through 1998 and indicate the number of fireworks (in millions) used and the related injuries.   Fireworks in use  x Related injuries  y 67.6 12 87.1 12 117 12 115 10 118 7800 Send data to Excel   Draw a scatter plot.

Find the z-score of the given percentile with a graph. 1. P35 2. P55 3. P45 4. P25

Match the coefficient of determination to the scatter diagram. The scales on the x-axis and y-axis are the same for each scatter diagram. (a) R? = 0.94, (b) R? = 0.27, (c) R? = 1 (a) Scatter diagram Explanatory (b) Scatter diagram (c) Scatter diagram Explanatory II Explanatory Response Respose OSuodsay

C. Describe the four characteristics of association