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In Each Trial of an Experiment, Participants See a Warning

question 25

Multiple Choice

In each trial of an experiment, participants see a warning signal and then, a half-second later, see a pair of letters. The participants press one button if the letters are the same (e.g., W W) and a different button if the letters are different (e.g., P X) . In 80% of the trials, the warning signal is identical to the letters that will be shown on that trial. Listed below are the warning signals and the test stimuli presented on trial number 97 of the procedure. Group 1 warning signal = L; test pair = L L
Group 2 warning signal = U; test pair = L L
Group 3 warning signal = +; test pair = L L
In this setup we should expect fastest responses from:

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Definitions:

Critical Value

A threshold value that is compared with the test statistic to determine whether to reject the null hypothesis in hypothesis testing.

P-value

A measure in statistics that helps in determining the significance of results obtained in an experiment or survey. It indicates the probability of observing results as extreme as those observed if the null hypothesis is true.

Average Sales

The mean amount of sales over a certain period, calculated by summing all sales figures and dividing by the number of sales transactions.

Critical Value

A point on the scale of the test statistic beyond which we reject the null hypothesis; it marks the threshold for significance in hypothesis testing.