The amount of time it took 25 respondents to solve a particular task has been recorded in
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The amount of time it took 25 respondents to solve a particular task has been recorded in the following table:
Develop a table to estimate the sample mean and sample standard deviation of the time using formulas (4.17) and (4.19).
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Time 5 ≤ t < 10 10 ≤ t < 15 15 ≤ t < 20 20 ≤ t < 25 Frequency (f) 1 4 6 4
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