Mrs. Carissi purchased a new smartphone. The cost of the phone was $675 and the local tax rate is 6.2%.

716.85

Step-by-step explanation:

6.2 / 100 = 0.062

0.062 x 675 = 41.85

41.85 + 675 = 716.85

39.308 pounds

Step-by-step explanation:

We assume that the given population is normally distributed.

Given : Significance level :

Sample size : n= 12, which is  small sample (n<30), so we use t-test.

Critical value (by using the t-value table)=

Sample mean :  

Standard deviation :

The lower bound of confidence interval is given by :-

i.e.

Hence, the lower bound for the 98%  confidence interval for the mean yearly sugar consumption= 39.308 pounds