Stats pt3

If the data in the table were entered into a regression calculator to produce a scatterplot and trend line, which window size would display all the points?

0<x<20; 0<y<60

What is the slope of a trend line that passes through the points (1, 3) and (10, 25)?

22/9

The data in the table are entered into a regression calculator. Based on the line of best fit produced by the regression calculator, which is the best prediction for the value of y when x=64?

260

When a trend line is drawn on a scatterplot, there are 4 points above the trend line. About how many points should be below the trend line?

4

For which of these sets of data would all the points be displayed on a scatterplot if the window size on a regression calculator were set to 5<x<15; 25<y<75?

A

Which two points should the line of best fit go through to best represent the data in the scatterplot?

C. (2, 15) and (4, 9)

Which two points should the line of best fit go through to best represent the data in the scatterplot?

C. (3, 8) and (5, 12)

Peter attempted to use the divide-center method to find the line of best fit on a scatterplot. What was his mistake?

He had a different number of points to the left of the vertical line than to the right of the vertical line.

Which pair of points should be used to find the line of best-fit for the scatterplot?.

K and M

Mia's work to find the slope of a trend line through the points (3, 10) and (35, 91) is shown below. What was the first error that Mia made?

Mia switched the numerator and the denominator.

Miguel is calculating the slope of a line of best-fit in the scatterplot below. Which pair of points would be best for Miguel to use?

Q and V

Carol is investigating the relationship between the number of minutes spent doing aerobics and the number of calories burned. Her data are shown in the table. Using a regression calculator, she got a regression line of y=0.19x+0.49. What did she do wrong?

She entered the minutes doing aerobics for y and the number of calories burned for x into the regression calculator.

Tanica drew a line of best fit on a scatterplot, as shown below. The equation of the line is y=-1.02x+7.09. Using the line, she predicted that when the value of x is 0.5, the value of y will be approximately 7.6. What was her mistake?

She forgot the minus sign before the first term on the right side of the equation when she predicted y.

Loren solved the equation 10=19/9 (149)+b for b as part of her work to find the equation of a trend line that passes through the points (1, 130) and (10, 149). What error did Loren make?

She should have solved 149=19/9 (10)+b for b.

James needs to draw the trend line for both scatterplot A and scatterplot B. Which of these statements is correct?

The trend line for scatterplot A will have a negative slope, and the trend line for scatterplot B will have a positive slope.

The table shows the weight of a dog in pounds at various ages in months. What values should be entered for x and y into a regression calculator to find the equation of the trend line?

x: 3, 4, 6, 8, 9, 12 y: 2, 5, 7, 10, 11, 15

What is the equation of the line of best fit given by a regression calculator for the data in the table?

y=5.60x+9.12