MATH 221 Week 7 Homework
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$20.00
| Institution | MATH 221 Statistics for Decision-Making |
| Contributor | Rizelle |
- Question: Two variables have a negative non-linear correlation. Does the dependent variable increase or decrease as the independent variable increases?
- Question: What does the variable r2 represent?
- Question: A golfer wants to determine if the type of driver she uses each year can be used to predict the amount of improvement in her game. Which variable would be the response variable?
- Question: What would be the notation for an estimate of y for a specific value of x?
- Question: Which of the following graphs displays the regression equation of ŷ=-0.30x + 6.25
- Question: Find the regression equation for the following data set
- Question: A data set whose original x values ranged from 41 through 78 was used to generate a regression equation of ŷ=5.3x – 21.9. Use the regression equation to predict the value of y when x=70.
- Question: A data set whose original x values ranged from 120 through 351 was used to generate a regression equation of ŷ=0.06x +
14.2. Use the regression equation to predict the value of y when x=119.
- Question: A data set whose original x values ranged from 137 through 150 was used to generate a regression equation of ŷ=-4.5x +
51. Use the regression equation to predict the value of y when x=139.
- Question: If the linear correlation coefficient is -0.654, what is the value of the coefficient of determination?
- Question: If the coefficient of determination is 0.184, what percentage of the variation in the data about the regression line is explained?
- Question: If the coefficient of determination is 0.738, what percentage of the variation in the data about the regression line is unexplained?
- Question: If the independent variables explained less than 50% of the variation in the dependent variables, which of the following would be true?
- The equation used to predict how tall a dog will be as an adult is ŷ=4.5 + 0.7x1 + 0.55x2, where x1 is the height of the mother and x2 is the height of the father. Use this equation to predict the height of a puppy whose mother is 41.3 inches tall and whose father is 44.9 inches tall.
- Question: The equation used to predict how long a cold will last is
ŷ=-1.8 + 0.09x1 + 3.2x2 – 1.9x3, where x1
is person’s temperature on the first day, x2 is number of people seen each day, and x3 is the amount of sleep the person gets. Use this equation to predict how long a cold will last with a temperature of 101.4 degrees, an average of 4 people seen each day, and 6 hours of sleep.
| Instituition / Term | |
| Term | Summer 2021 |
| Institution | MATH 221 Statistics for Decision-Making |
| Contributor | Rizelle |
