Skip to contentMATH 534 Week 6 Quiz
- Question: A value of -1 for the coefficient of correlation between two variables means that the two variables are _____________.
- Question: If there is positive correlation between two sets of numbers, then ____________-.
- Question: If the correlation coefficient between variables X and Y is roughly zero, then ___________.
- Question: Determine the Pearson product-moment correlation coefficient for the following data.
- Question: A quality manager is developing a regression model to predict the total number of defects as a function of the day of week the item is … Production runs are done 10 hours a day, 7 days a week. The dependent variable is _____________-.
- Question: In the equation y = m x + b, which represents a straight lime, b is the _____________.
- Question: If the relationship between y and x is given by the equation y = 1.57 — 0.0407 x, the slope coefficient 0.0407 means this: _________.
- Question: Least squares regression line is one that ______________.
- Question: The following regression model was … to sample data with 12 observations: y = 30 + 4.50x. What is the … value of y for a given value of x = 6?
- Question: For a least squares regression line, the sum of the residuals is ___________.
- Question: If the standard error of the estimate for a regression model … to a large number of … observations is 1.75, approximately 95% of the residuals would lie within ___________.
- Question: If x and y in a regression model are totally … , _________.
- Question: Suppose we are making predictions of the dependent variable y for specific values of the independent variable x using a simple linear regression model holding the confidence level constant. Let Width (C.I) = the width of the confidence interval for the average value y for a … value of x, and Width (P.I) = the width of the prediction interval for a single value y for a given value of x. Which of the following statements is true?
- Question: In the regression equation, y = 2.164 + 1.3657x, n = 6, the mean of x is 8.667, SSxx= 89.333 and Se = 3.44. A 95% confidence interval for the average of y when x = 8 is _____________.
- Question: A manager wishes to predict the annual cost (y) of an automobile … on the number of miles (x) driven. The following model was … : y = 2,000 + 0.42x. If a car is … 30,000 miles, the … cost is ________.
- Question: A manager wants to predict the cost (y) of travel for salespeople … on the number of days (x) spent on each sales trip. The following model has been … : y = $400 + 120x. If a trip took 4 days, the … cost of the trip is ___________.
