x | 3 | 7 | 15 | 40 | 74 |
y | 40 | 35 | 30 | 28 | 19 |
Use a calculator to verify that Σx = 139,
Σx2 = 7359, Σy = 152,
Σy2 = 4870, and Σxy = 3341. Compute
r. (Round your answer to three decimal places.)
r =
Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. x 3 7 15 32 70 y 40 35 30 26 18 Use a calculator to verify that Σx = 127, Σx2 = 6207, Σy = 149, Σy2 = 4725, and Σxy = 2907. Compute r. (Round your answer to three decimal places.) r = 3
Let x be the percentage of 16- to 19-year-olds not in school and not high school graduates. Let y be the reported violent crimes per 1000 residents. Six small cities in Arkansas (Blytheville, El Dorado, Hot Springs, Jonesboro, Rogers, and Russellville) reported the following information about x and y. x 24.5 19.0 18.5 14.9 19.0 17.5 y 12.9 4.8 8.6 1.3 0.8 3.6 Complete parts (a) through (e), given Σx = 113.4, Σy = 32, Σx2 = 2192.76, Σy2 =...
Do heavier cars really use more gasoline? Suppose a car is chosen at random. Let x be the weight of the car (in hundreds of pounds), and let y be the miles per gallon (mpg). x 30 43 31 47 23 40 34 52 y 30 21 22 13 29 17 21 14 Complete parts (a) through (e), given Σx = 300, Σy = 167, Σx2 = 11,908, Σy2 = 3761, Σxy = 5885, and r ≈ −0.888. (a) Draw...
Do heavier cars really use more gasoline? Suppose a car is chosen at random. Let x be the weight of the car (in hundreds of pounds), and let y be the miles per gallon (mpg). x 29 44 33 47 23 40 34 52 y 32 20 26 13 29 17 21 14 Complete parts (a) through (e), given Σx = 302, Σy = 172, Σx2 = 12,064, Σy2 = 4036, Σxy = 6066, and r ≈ −0.902. (a) Draw...
How much should a healthy Shetland pony weigh? Let x be the age of the pony (in months), and let y be the average weight of the pony (in kilograms). X: 3, 6, 12, 18, 22 Y: 60, 95,140, 170, 183 (b) Use a calculator to verify that Σx = 61, Σx2 = 997, Σy = 648, Σy2 = 94,614, and Σxy = 9,516. compute R (round to 3 decimal places)
Let x be the age of a licensed driver in years. Let y be the percentage of all fatal accidents (for a given age) due to failure to yield the right of way. For example, the first data pair states that 5% of all fatal accidents of 37-year-olds are due to failure to yield the right of way. x 37 47 57 67 77 87 y 5 8 10 17 33 42 Complete parts (a) through (e), given Σx =...
Let x be per capita income in thousands of dollars. Let y be the number of medical doctors per 10,000 residents. Six small cities in Oregon gave the following information about x and y. x 8.2 9.7 10.0 8.0 8.3 8.7 y 9.5 18.7 20.2 10.2 11.4 13.1 Complete parts (a) through (e), given Σx = 52.9, Σy = 83.1, Σx2 = 469.91, Σy2 = 1253.59, Σxy = 751.48, and r ≈ 0.991. (a) Draw a scatter diagram displaying the...
Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. x 3 7 15 33 74 y 40 35 30 26 16 (b) Would you say the correlation is low, moderate, or strong? positive or negative? moderate and positive strong and negative moderate and negative low and negative strong and positive low and positive (c) Use a calculator to verify that Σx =...
Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. x 3 7 15 38 73 y 40 35 30 28 20 (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? positive or negative? strong and positivestrong and negative low and negativemoderate and negativelow...
Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. x 3 7 15 36 72 y 40 35 30 26 21 (a) Make a scatter diagram of the data and visualize the line you think best fits the data. You can get Flash Player free from Adobe's website. (b) Would you say the correlation is low, moderate, or strong? positive or negative?...