Question: In the past, monthly sales for HOOPS, a small software firm, have averaged $20,000 with standard deviation $4000. During the most recent year, sales averaged

In the past, monthly sales for HOOPS, a small software firm, have averaged $20,000 with standard deviation $4000. During the most recent year, sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense at the 5% level)? Assume monthly sales are at least approximately normally distributed.

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