Asurvey was done that asked people to indicate whether they preferred pool swimming or ocean swimming. the results of the survey are shown in the two-way table.

chantal is making a relative frequency table from this data.

what operation should chantal perform to determine the relative frequency of a person over 30 years old who prefers ocean swimming?

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels. ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0