Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. The "cold start ignition time" of an automobile engine is being investigated by a gasoline manufacturer. The following times (seconds) were obtained for a test vehicle. (a) Calculate the sample mean, sample variance, and sample standard deviation. Round your answers to 4 significant digits. Mean = Variance = i 1.76, 1.92, 2.69, 2.32, 3.05, 3.22, 2.50, 1.91 i seconds seconds²

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