Exam 5: Statistics

A Sprint Telecom executive believes customers in a market segment are in their late 20s. He chooses and studies a sample of cell phone users with a mean age of 28 years when in fact, the population mean is 38 years. The probability of a Type II error increases as you:

Kruger's grocery chain asks customer during their Saturday shopping if they would fill out surveys. In return, they offer them in-store savings. Customers are chosen randomly and the overall sample numbers depends on customer compliance. What is this type of sampling referred to?

A significant limitation of regression analysis is:

All of the following are the components of the multiple regression model EXCEPT:

Jason's company manufactures parts for large car producers such as Toyota and Honda. Management at his company is committed to continuous improvement in manufacturing standards and practices through rigorous training. What is the name of this practice?

The following is a multiple regression model. What do the regression coefficients b₁ and b₂ represent? Y _i= b₀ + b₁X_1i + b₂X_2i +e_i

In regression analysis, the following assumptions are made EXCEPT:

Quantitative research methods involve the measurement and analysis of data. All of the following are examples of quantitative methods EXCEPT:

NEC launches a new TV set in Washington State in 2008 with a limited release. Company executives are interested in tracking sales' patterns in order to make production decisions for the following year. What graphical tool can display sales figures by month?

What are the advantages of using the Least Squares Method rather than the Compass Rule adjustment to address traverse closure errors?

Jeffrey is a real estate agent who wishes to study the relationship between the selling price of a house and its size (measured in feet) in Manhattan. He develops a simple linear regression model as seen below. What is the slope of the model? Houseprice = 95.5 + 0.25 (square feet) + 13

Jackson's team is choosing participants for his marketing research from a list of customers. They decide to choose every 7^th name in a list of telephone numbers within the directory. What is this type of sampling referred to?

Kroger's grocery stores in Houston are interested in gauging the response of weekend managers to door promotions. By selecting specific managers, what sampling method are executives using in their research?

Given a data set of high performing sales numbers from a population of 2000 sales people across a national company, how is a sampling error calculated?

Executives at a national mining company insist that their employees did not contract lung cancer from occupational pollutants. They develop a regression model that shows 67% of the lung cancers reported are due to other factors such as personal smoking and genetic predisposition. The random error term in the linear regression model indicates:

An Entertainment consulting agency wishes to study the effect of salary bonuses on employee performance. Specifically, they wish to find out if an annual bonus increases the number of signed clients. What does employee performance represent, in this case?

In linear regression, the total variation explained by the variation attributable to the relationship between X (the independent variable) and Y (the dependent variable). Unexplained variation is attributable to factors outside of X. What is this variation called?

What is the mean for the following expenditures? $79.84, $278.99, $342.16, $466.25, $111.39, $502.47, $98.12

State officials wish to study those factors that affect adherence to job rehabilitation after a job-related injury. The propose to study two particular factors: the extent of previous injury and the worker's educational level. What is this type of research design called?

A biomedical company is studying whether its knee joint replacement is causing nerve damage. After extensive tests, the researchers make an erroneous decision, concluding that the replacement does cause nerve damage. A Type I error is the probability of?