The following data represent the running times of films produced by two motion-picture companies. Compute a 90%
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The following data represent the running times of films produced by two motion-picture companies. Compute a 90% confidence interval for the difference between the average running times of films produced by the two companies. Assume that the running-time differences are approximately normally distributed with unequal variances.
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Time (minutes) Company 87 98 no 92 175 88 118 103 94 97 82 123 п
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