A medical device company knows that 12% of patients experience injection-site reactions with the current needle. If 6 people receive injections with this type of needle, what is the probability that at least one of them has an injection-site reaction? 0.0633
0.4644
0.5356
0.7200

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