In 2013, about Group of answer choices 40 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 20 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 30 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 87 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 10 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars.

The average u.s. household has $178,600 in life insurance. the standard deviation is $25,500. a local insurance agent would like to see how households in his city compare to the national average, and selects a simple random sample of 30 households from the city. for the households in the city, the average amount of life insurance is $188,800. a. based on the sample results, construct a 95% confidence interval for the true average amount of life insurance for households in the city. b. test the h0 : $178,600 ? ? to determine if the city's sample average is significantly different from the u.s. average amount of life insurance per household. use the conventional levels of significance.