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A computer manufacturer estimates on average 7.4 days of downtime per year. It's determined the average number of downtime days is 4.5 with a sample

A computer manufacturer estimates on average 7.4 days of downtime per year. It's determined the average number of downtime days is 4.5 with a sample deviation of 1.4 days. Assuming normally distributed test whether they average 7.4 days on entire population. a=.01. What is the test statistic

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