Chapter 1. The Logic of Randomized Comparative Experiments

true
Stat Tutor
true
true

Questions 1-2

1:46

Question 1.1

jul9FMbrmGdcHJwXIwRCI1JPZ9PNTMLG171Xpotj6g5lLpyYv0b0IbszRYM+Zb6WLi39I5rR5j758ClSFv2w+em2NbXUd1eHIt5Of+xm8pyArcZIba5c/dzauPn2yqyN5e6GTJX1WwuZu6LE+CSDa+swUkmIt2oH13pRV0drntrsVzf2J+4GhGB40sippIiw82VGEqgmTHhI/kkuiAo21g5Gyd15D5NihwhhJ609qU/BbCEremQNCeZWRAN4/hhr9m4DrK9h+SK/AuKAQ162ri+MKkgyOkyzV1p6wM0O3mLU3hxq+4f4Bi+GSoWRJVJ6+mH/A0sH1iH3Vj96qYqyEIE/CVahcFtD1bKLdJUgzXZD9KMTdy9/lBDaDcGpTcFKqgfzm37pXTYpDFkxAawZCVSn69U=
Incorrect. In theory, using a random device creates groups that are similar in all respects before treatments are applied.
Correct. In theory, using a random device creates groups that are similar in all respects before treatments are applied.
Incorrect. Try again.
2

Question 1.2

+XGlJPSmp3N8hoXTbY4JMUTIZTc4fRcKhCITzN+bWX7w9U6eRYpGpYyMLuB9wRCmqZ6w91qjxanqJoUfwYt4vKdVpUdkyKxZMlGydBrX31M4uDVuNC7LjnIRvLcMUZmObGu2Grsa6JjLr4tohK2ViUhYrc4tMA64TXPHwEzFHZJsKHhLdyiiRMhwVRoM3YvKOzmYHkJNJL5yaGUroTcalxR8ZHzCAwqTJru5FFcmM6IgaAyQXeuKCkqSiDs=
Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

Questions 3-6

3:42

Question 1.3

BDOlPTaErPqhtVp87qqM9ev/I1VnC+PQh5Ujz2R3BDT6GRWO9b/WWkiH1UvxfdbcIQWopDJLl4pLTqVKj4Nl90UHZoFDgPi6lJw0RUr3guxJh7ZwaOtuTeUARu8+UyGJQ16bLjo5CvNcAcr0SIRDvyQ3CPlyh4xQg2A53f4zFoUnFpq0wYxElwV6Y6GwuVhNOF309OQuNL+mK+5V+RKHA30hwOI=
Incorrect. Without a control group, we cannot know whether the response is due to the active treatment or to chance or to something else.
Correct. Without a control group, we cannot know whether the response is due to the active treatment or to chance or to something else.
Incorrect. Try again.
2

Question 1.4

4d3MujyZ7skTIfePmHtHLShYysIfjbl+CFsacOvT+zYB4CnpQ070V4D3fGtVf6s0HWtvlt5GBH8yRC00rK0IlsY96fvHFQp+3tu9YJmSohr3J9WTeVyb8wA5qwQ+V6TS/waHTY8gWewWEY3uMJ0DTmaycMA/JkQx0wvTT+iddQQ=
Incorrect. Randomization, whether in a survey or in an experiment, reduces bias.
Correct. Randomization, whether in a survey or in an experiment, reduces bias.
Incorrect. Try again.
2

Question 1.5

QT4BYuihzCKnV/rWVh04zDGPpUMu4la488bOR+YA7KpFjDuEfWBey11zupPYOC2lLPOA9HEmHnHO7H30KPZfA3KFuRpzh/EC0xWjHafvgq5i8SjHsOGp4sfGB5gZYOCpLBRI1asE3yeIhxDWr1HUj2EV265ghIlZrZsPoiWyZHICmWRYBZjymcOvLD9I1NQF
Incorrect. Without replication, we cannot measure chance variation.
Correct. Without replication, we cannot measure chance variation.
Incorrect. Try again.
2

Question 1.6

UpkFTbV3iXl7sDnmLdj49Z2vcu2edfMt144WF0wudkpPjAC8lxt7ue4eHQwv65iFU/GPQ/uH/hLe2QsDZnmCk1vRIUE2ibfZPUSCkiyUdGizDEDXOVb2V+zEOKELohzd/maJUgTDuYRQPpVfGGK67n1iwnSlAgKZ1RWCKA5e2DDyD/cW
Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

Question 7

5:04

Question 1.7

uR2QPI+c4p/W5Frjdc9juyJo9LYdHNcL38WW51Opk+B4mPtFLvJaSZBjWcVD1N8PMjTpIFLjdM/gg9YiyCa9hBjSQQFXAqsgQIbQQNMKyB9VtZPbGpWAAbA0cmqQHOs09BTciOckEn5/5ze9FsKZoeAK6IwDpxguiFj9BTDI1sXZjazGGqfEY/nc55cAHqLSnvAH1hRwe7juHeYJziuc6wFsDrijgBrYKPrUZfXwDfNKB7OHwCI2auNPA3q8h3XQAV9GClYUXk834CCbr98zFMfqmPn9SD4GjU08AlJT0S76Fu/1j4yY47W1vsSE+4nxM62eD15HcM6hC79QmKmiKWqE1G6y+6jy+jbcdQ==
Incorrect. Most people think that significant mean important. But in statistics, the term "significant" implies "too big" to be due to chance.
Correct. Most people think that significant mean important. But in statistics, the term "significant" implies "too big" to be due to chance.
Incorrect. Try again.
2

Question 8

5:49

Question 1.8

g7g5srcQuRLDg2yUSxCgKiJsfXASfCKE9nCzbN6LXbJ9KhDJezFNY/VXAbmAc4suk1Imx3prlGABWLN6S3yZJ6BLstED2X8QHpy+6ciaUEtumVWjdx14Vuc1RYJE6MRh1Kc2rE0PBn5dLTcOJGtTH+hopY4=
Incorrect. Significance implies that the treatment works.
Correct. Significance implies that the treatment works.
Incorrect. Try again.
2