Listed below are costs (in dollars) of a sample of roundtrip flights between two cities. The flights involve one stop and a two week stay. Find the coefficient of variation for each of the two sets of data, then compare the variation. The formula for the coefficient of variation is standard deviation/mean=100. 30 Days in Advance: 252 288 284 295 240 253 319
1 Day in Advance: 450 623 564 987 623 1000 581

The coefficient of variation for prices of tickets purchases 30 days in advance is _%
The coefficient of variation for prices of tickets purchases 1 day in advance is _%
Is there a difference in variation between two data sets?
a. the cost of 1 day in davance have less variation than the cost of tickets purchases 30 days in advance.
b. the cost of tickets purchased 30 days in advance have less variation than the cost of tickets purchases 30 days in advance. Please help me with step by step instructions!

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.