How much can we expect the strength to change at 28 days (in pounds per square inch) when the accelerated strength is increased by 1 psi? R=   What is the expected value of the resistance at 28 days when the accelerating resistance is 2540? R =

Data was recorded for the temperature, in degrees Celsius, of a cup of coffee over a 30-minute period. Given the regression equation, In(Temp) = 4.20 0.023(Time), what is the predicted temperature after 3 minutes? 33.45 °C 62.24 °C 65.17 °C 66.69 °C

A researcher investigates the relationship between cigarette smoking (X)  and work absences (Y). The number of cigarettes smoked daily and the number of days absent from work due to illness are collected for N= 12 employees. The preliminary results are below: What is the regression equation?  How many absences (Y) would expect someone who smokes  X = 10  cigarettes a day to have?

A set of n=15 pairs of x and y scores has sx=10, ssy=40, and sp=30. What is the slope for the regression for predicting y from x?

The US government is interested in understanding what predicts death rates.  They have a set of data that includes the number of deaths in each state, the number of deaths resulting from vehicle accidents (VEHICLE), the number of people dying from diabetes (DIABETES), the number of deaths related to the flu (FLU) and the number of homicide deaths (HOMICIDE).  Your run a regression to predict deaths and get the following output: At α = .10, which variable(s) is/are significant predictors of deaths?

What happened to the standard error of educ after adding KWW to the model? Discuss.  Do you agree or disagree with the following statement? “If the log of the dependent variable appears in the regression, changing the unit of measurement of any independent variable affects both the slope and intercept coefficients”. Discuss by providing the resource.

If you have a b of 0.56 in a regression equation, what does this mean?     For every one-unit increase in x, you get an increase of 0.56 in y     r = .31     On average, the variability of real scores around the regression line is 0.56     For every 1 standard deviation increase in x, you get an increase of 0.56 standard deviations in y

Suppose you obtain the following regression model, E[y]=91+79*x1 +20*x1*x2. What is the impact of  a 39 unit change of x1 on the expected value of y when x2 is at its mean of 40?

The slope, b represents * O predicted value of Y when X = 0. O the estimated average change in Y per unit change in X. O variation around the line of regression. O the predicted value of Y.

The estimated regression equation for a model involving two independent variables and 10 observations follows. ý = 22.1370 + 0.5303Xq + 0.4920X2 (a) Interpret b₁ in this estimated regression equation. O b₁ = 0.5303 is an estimate of the change in y corresponding to a 1 unit change in x₂ when x₁ is held constant. O b₁ = 0.5303 is an estimate of the change in y corresponding to a 1 unit change in x₁ when X₂ is held constant. O b₁ = 22.1370 is an estimate of the change in y corresponding to a 1 unit change in x₁ when x₂ is held constant. O b₁ = 0.4920 is an estimate of the change in y corresponding to a 1 unit change in x₂ when x₁ is held constant. O b₂ = 0.4920 is an estimate of the change in y corresponding to a 1 unit change in x₁ when x₂ is held constant. Interpret b₂ in this estimated regression equation. O b₂ = 0.4920 is an estimate of the change in y corresponding to a 1 unit change in x₂ when x₁ is held constant. O b₂ = 22.1370 is an estimate of the change in y corresponding to a…