After 4 years, what is the total amount of a compound interest investment of $20,000 at 2% interest, compounded monthly? a) $25,409.78 b) $21,648.64 c) $23,514.81 d) $21,664.30

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?