A hole-punch machine is set to punch a hole 1.85 cm in diameter in a strip of sheet metal in a manufacturing process. Th

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A hole-punch machine is set to punch a hole 1.85 cm in
diameter in a strip of sheet metal in a manufacturing process. The
strip of metal is then creased and sent on to the next phase of
production, where a metal rod is slipped through the hole. It is
important that the hole be punched to the specified diameter
of 1.85 cm. To test punching accuracy, technicians have
randomly sampled 12 punched holes and measured the diameters. The
data (in centimeters) follow. Use an alpha of 0.10 to determine
whether the holes are being punched an average
of 1.85 centimeters. Assume the punched holes are
normally distributed in the population.
The value of the test statistic is ? and we ?
1.82, 1.85, 1.84, 1.89, 1.82, 1.86, 1.86, 1.88, 1.88, 1.83,
1.85, 1.85