A Least Squares Line

question 29

Multiple Choice

A least squares line:

• A)assumes a relationship between the slope of x and the intercept of y
• B)may be used to predict a value of y if the corresponding x value is given
• C)must be linear, upward-sloping and have a positive y-intercept
• D)minimizes the sum of the deviations between the observed value of y and the estimated value of y
• E)all of the above

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Definitions:

Multiple Controls

In experimental research, refers to the use of two or more control groups to compare against the experimental group, enhancing the validity of the results.

Case-control Studies

Observational studies that compare individuals with a particular condition or disease (cases) to those without (controls) to identify risk factors.

Brain Tumors

Abnormal cell growths within the brain that can be benign (non-cancerous) or malignant (cancerous).

Case Series

A research study that tracks subjects with a known exposure or subjects who have undergone a particular treatment to document outcomes and patterns over time.