Zack's science teacher gave each student in his class 15.0 grams of an unknown substance to identify. each student was required to verify the mass of their substance by taking four measurements. which of zack's measurement was the most accurate of the four recorded?

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?