The Following Table Shows the Results of a Survey of 390

question 163

Essay

The following table shows the results of a survey of 390 authors by a (fictitious) publishing company: $$\begin{array} { | l | l | l | l | } \hline & \begin{array} { l } \text { New } \\\text { Authors }\end{array} & \begin{array} { l } \text { Established } \\\text { Authors }\end{array} & \text { Total } \\\hline \text { Successful } & 60 & 30 & 90 \\\hline \text { Unsuccessful } & 110 & 190 & 300 \\\hline \text { Total } & 170 & 220 & 390 \\\hline\end{array}$$ ​
An author is chosen at random.
Compute the estimated probability of the event that the author is unsuccessful.

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Definitions:

Illusion

A false perception or misinterpretation of a real sensory stimulus, often leading to an incorrect understanding of reality.

Just Noticeable Difference

The minimum difference in stimulation required to detect a difference between two stimuli, also known as the difference threshold.

Perceptual Threshold

The minimum level at which a stimulus is detected by the senses.

Difference Threshold

is the minimum detectable difference between two sensory stimuli, also known as the just noticeable difference (JND), essential in sensory and perception studies.