Use the Following Information to Answer Questions (12)-(15)

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Use the following information to answer questions (12)-(15). Many couples believe that it is getting too expensive to host an "average" wedding in the United States. According to a statistics study in the U.S., the average cost of a wedding in the U.S. in 2014 was $25,200. Recently, in a random sample of 35 weddings in the U.S. it was found that the average cost of a wedding was $24,224 with a standard deviation of $2,210.
-a. Find the critical z value for the given level of confidence and multiply by the standard error using the formula
b. Find the critical t value for the given level of confidence and multiply by the standard error using the formula
c. Find the critical z value for the given level of confidence and multiply by the standard error using the formula
d. Find the critical t value for the given level of confidence and multiply by the standard error using the formula