In Experimental Research,which Variable Is Manipulated by the Researcher So

question 112

Multiple Choice

In experimental research,which variable is manipulated by the researcher so that its impact on another variable may be assessed

• A) controlled variable
• B) independent variable 
• C) extraneous variable
• D) dependent variable

Apply multiple regression analysis to time series data.

Identify appropriate forecasting models based on characteristics of the time series such as trend and seasonality.

Calculate mean square error (MSE) for model accuracy assessment.

Calculate mean absolute percentage error (MAPE) for forecasting accuracy.

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Definitions:

ANOVA

Stands for Analysis of Variance, a statistical method used to compare means of three or more samples to understand if at least one of the sample means differs significantly from the others.

Mean Square

A statistical measure used in variance analysis, computed by dividing the sum of squares by the degrees of freedom.

Error

The difference between the observed value and the true value of a parameter in data, indicative of the degree of inaccuracy or deviation.

P-value

In hypothesis testing, the p-value is the probability of obtaining test results at least as extreme as the observed results, under the assumption that the null hypothesis is correct.