# A time study of a factory worker has revealed an average observed time of 3.20 minutes,...

###### Question:

A time study of a factory worker has revealed an average observed time of 3.20 minutes, with a standard deviation of 1.28 minutes. These figures were based on a sample of 45 observations. Assume that the firm wants to be 90% confident that the standard time is within 5% of the true value. (Round all intermediate calculations to two decimal places before proceeding with further calculations.) | Based on the given information and the given confidence level and accuracy level, the number of observations that would be necessary for the time study = observations (round your response up to the next whole number). Enter your answer in the answer box and then click Check Answer. nart

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