Stats Test 6-9

For random sample of 20 professional athletes, there is a strong, linear relationship between the number of hours of exercise per week and the resting heart rate. Which of the following is a reasonable value for the correlation between the number of hours athletes exercise per week and they're resting heart rate?

-0.87

The common logarithm of each value of the response of variable is taken. Which of the following is closest to the predictive value of the response variables for X equals 4.8?

1.26

which of the following statements about a lease squares regression analysis is true? 1) appoint with a large residual is an outlier. 2) appoint with a hide leverage has Y value that is not consistent with the other Y values in the stat 3) The removal of an influential point from a data set could change the value of the correlation coefficient

3 only

age of a dairy cow in the amount of milk produced, and gallons per week. Based on the model, what is the difference in predicted amounts of milk produced between a cow of five years in a cow of 10 years?

A cow or five years is predicted to produce 5.5 more gallons per week

which of the following is the best description of a positive association between two variables?

As the value of one of the variables increases, the value of the other variable tends to increase

age in years and the growth of sea turtles. Does the residual plot support the appropriateness of a linear model?

No, because the graph displays a U-shaped pattern

at a large airport, data were recorded for one month on how many baggage items were unloaded from each flight. Which of the following statements is a correct interpretation of the word strong in the description of the association?

The actual time required to deliver all the items to the baggage claim area based on the number of items unloaded will be very close to the predicted time by the least squares model

students heights versus corresponding arm span length, in inches, is shown below. One of the points in the graph is labeled a period of .8 is removed which of the following statements would be true?

The slope of the least squares regression line increases and the correlation coefficient increases

A tennis ball was thrown in the air. What does this correlation should just about the relationship between time and height?

There is no linear relationship between time and height

A road runner tail length. Based on the residual, does the regression model over estimate or underestimate The tail length of the Road Runner?

Under estimate, because the residual is positive

Cubs spends playing, the sooner the couple begin to hunt. Based on the scatterplots, for which gender does there appear to be evidence that the more time a lion cub spends playing, the sooner the lion cub is likely to begin hunting?

for females only

regression equation to predict the weight of a fish based on its length. Would it would be appropriate to use this model to predict the weight of a fish other species that is 3 inches long?

no, because 3 inches falls above the maximum value of lengths in the sample