Why monthly sales have changed statistically

Reference no: EM13131387

In the past, monthly sales for HOOPS, a small software firm, have averaged $20,000 with standard deviation $4000. During the last year sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense)? Use 0.05. Assume monthly sales are normally distributed.

Reference no: EM13131387

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