TABLE 17-8 Recently, a University Switched to a New Type of Computer-Based

question 56

Short Answer

TABLE 17-8
Recently, a university switched to a new type of computer-based registration. The registrar is concerned with the amount of time students are spending on the computer registering under the new system. She decides to randomly select 8 students on each of the 12 days of the registration and determine the time each spends on the computer registering. The range, mean, and standard deviation of the times required to register are in the table that follows.

-Referring to Table 17-8, an chart is to be used for the time required to register. One way to obtain the control limits is to take the grand mean and add and subtract the product of A2 times the average of the sample ranges. For this data set, the value of A2 is ________.

---

Definitions:

Residual Plot

A graph showing the residuals on the vertical axis and the independent variable on the horizontal axis, used to assess the fit of a model.

Regression Inferences

The process of drawing conclusions about population parameters based on a regression model fitted to a sample of data.

Proficiency Test

An evaluation designed to measure the knowledge, skills, or abilities in a specific area or profession.

Regression Line

A straight line that best fits the data points on a scatter plot, showing the relationship between two variables.