A Researcher Is Interested in Estimating the Mean Weight of a Semi

question 52

Multiple Choice

A researcher is interested in estimating the mean weight of a semi tracker truck to determine the potential load capacity.She takes a random sample of 17 trucks and computes a sample mean of 20,000 pounds with sample standard deviation of 1,500.She decides to construct a 98% confidence interval to estimate the mean.The degrees of freedom associated with this problem are _______.

• A) 18
• B) 17
• C) 16
• D) 15
• E) 20

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Definitions:

Control

In experimental design, control refers to an experimental group that does not receive any experimental treatment in order to provide a baseline for measuring changes that might occur in other groups. As a goal of research, control refers to gaining information about human behavior in order to be able to predict and control it.

Experimental Design

A research method involving the manipulation of one or more independent variables to determine their effect on dependent variables, allowing for control of confounding factors to establish causality.

Participants

Individuals who have volunteered to be in a research project, or in Hymes’s theory, the people present in a speech situation and their roles and relationships.

Control Groups

Experimental groups not exposed to any experimental variable.