Regression analysis with t = 1 to 80 was used to develop the following forecast equation: 
= 250 + 7.8t + 1.4Q1− 1.7Q2− 1.4Q3,where 
Forecast the next four values.
Definitions:
Standard Errors
A measure of the statistical accuracy of an estimate, reflecting the variability of the sampling distribution.
Type II Error
The mistake of failing to reject a false null hypothesis in a statistical test, also known as a false negative.
Control Chart
A tool used in quality control processes to monitor, control, and improve the process quality by plotting data points in time order and identifying any signals of unusual variation.
Type Error
Often refers to a Type I or Type II error in statistical hypothesis testing, misidentification of a true condition.
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