A person's resting heart rate decreases with an increase in cardiovascular activity creating a negative correlation.  The points on a corresponding scatter diagram   a. form a circle.   b. have an unknown pattern.   c. tend to move downward from left to right.   d. tend to move upward from left to right.

Create a dot plot of the following data. Make sure to label the graph and both axes appropriately. After creating the plot, write a short description of the shape.  You may scan this and upload a pdf, insert a link from a google doc, or upload an image file/screenshot that you create of your graph. Grade on Probability Test 75      80      82      41     92     98      79      83      100      87     85     73     70

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Grass buffer strips are grassy areas that are planted between bodies of water and agricultural fields. These strips are designed to filter out sediment, organic material, nutrients, and chemicals carried in runoff water. The figure [SEE PHOTO A] below shows a cross-sectional view of a grass buffer strip that has been planted along the side of a stream. A study in Nebraska investigated the use of buffer strips of several widths between 5 feet and 15 feet. The study results indicated a linear relationship between the width of the grass strip (x), in feet, and the amount of nitrogen removed from the runoff water (y), in parts per hundred. The following model was estimated. yˆ = 33.8 + 3.6x A scientist in California wants to know if there is a similar relationship in her area. To investigate this, she will place a grass buffer strip between a field and a nearby stream at each of eight different locations and measure the amount of nitrogen that the grass buffer strip removes, in parts per…

For which pair of variables is it impossible to determine the direction of the relationship?     a. Age and number of tickets issued for traffic violations     b. Family income and BMI     c. Race/ethnicity and attending a classical music performance in the last year     d. Occupational prestige and grocery budget

In the United States, it is illegal to drive with a blood alcohol concentration of 0.08 or higher. (A blood alcohol concentration of 0.08 indicates 0.08% alcohol in the blood.) The scatter plot shows the relationship between the number of one-ounce beers consumed per hour by a 200-pound person and that person's corresponding blood alcohol concentration. Also shown is a line that passes through or near the data points. Blood Alcohol Concentration Based y on a Body Weight of 200 Pounds 0.14 0.12 0.10 (7, 0.121) 0.08 0.06 0.04 (3, 0.053) 0.02 2 3 4 5 7 Number of Beers per Hour Source: National Highway Traffic Safety Administration a. Use the two points whose coordinates are shown by the voice balloons to find the point-slope form of the equation of the line that models the blood alcohol concentration of a 200-pound person, y, who consumes x one-ounce beers per hour. b. Write the equation from part (a) in slope-intercept form. Use function notation. c. Use the linear function to predict…

Find the mean, median, and mode of the data, if possible. If any of these measures cannot be found or a measure does not represent the center of the data, explain why. The durations (in minutes) of power failures at a residence in the last 6 years are listed below. 84 22 35 112 112 51 84 12 54 69

Twenty five right-handed students were asked to turn a knob (using their right hands) that moved an indicator by screw action. There were two identical instruments, one with a right-hand thread (the knob turns clockwise) and the other with a left-hand thread (the knob turns counterclockwise). The data presented below gives the times (in seconds) each subject took to move the indicator a fixed distance: Obs.# R Obs.# R L L Obs.# R 1 113 8 116 166 22 100 2 105 105 9 75 146 23 89 3 130 133 10 96 123 24 85 4 101 108 11 122 135 25 88 5 138 115 12 103 6 118 170 13 116 7 87 103 14 107 At 1% level of significance, can we conclude that these right-handed students found it easier to use the knobs with a right-hand thread? Use the following form of the difference: right-left. 1. Test Stat: L 137 2. Critical Region: a. T> 2.492 b. Tabs (2.492) c. T> abs (-2.492) d. T < -2.492 Obs.# R 15 118 16 103 17 111 18 104 19 111 147 20 89 87 21 78 145 78 107 84 148 112 93 76 L 116 78 101 123 3. Conclusion:…

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Following are the GPA's of the 30 students from a certain university who participated in a track meet. Draw a dot plot to better display the data. 3.2, 2.8, 2.0, 1.9, 3.0, 3.2, 2.9, 2.2, 2.1, 4.0, 3.5, 3.0, 3.1, 2.1, 3.5 O 4.0, 3.1, 3.3, 2.8, 3.9, 3.9, 3.7, 2.4, 2.9, 3.7, 2.7, 3.0, 2.7, 2.9, 3.9 Select the correct graph below. O A. OB. XX XX XXXXX X X XX x x XX XXXXXXX x x Xx XXXXXX XXX XXXXXX x x Xx XXXX X 15 25 35 1.5 25 35 OC. OD. XX XXX XXXXXXX x x XX XX XX X X X X Xx x x XXX X 15 25 3.5 1.5 25 3.5 Click to select your answer. Prt Scn, Home End DII F3 F5 * F2 F4 F1 & #3 %24