Harold espera en su fiesta de cumpleaños a 20 personas, pero 17 asistieron. ¿Cuál fue el porcentaje de error? A. 19.40%

B. 17.64%

C. 32%

D. 16.3%

PLS HELP

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?