How Many Observations Should Be Made If She Wants to Be

question 146

Multiple Choice

How many observations should be made if she wants to be 95.44 percent confident that the maximum error in the observed time is two seconds? Assume that the standard deviation of the task time is 6 seconds.

• A)5
• B)6
• C)30
• D)36
• E)49

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Definitions:

Double-Blind Study

An experiment in which neither the people being studied nor the individuals running the study know who is in the control group and who is in the experimental group until after the results are tallied.

Observational Study

A research method where the researcher observes subjects in their natural environment without intervention.

Systematically Watches

The act of observing or monitoring something in a methodical and organized manner.

Affecting Subjects

Influencing participants in a study or experiment, potentially altering their behavior or responses.