1. ?The U.S. Census Bureau needs to estimate the median income of females in the U.S. They collect incomes from 3500 females. State the variable, individual, population, sample, parameter, and statistic:
a. Female in the US
b. Income of a female in the US
c. Set of income responses from all females in the US
d. Set of income responses from 3500 females in the US
e. Median income of set of all females in the US
f. median income of set of 3500 females in the US
2.? A doctor trying to see if a new stent works longer for kidney patients asks patients if they are willing to have one of two different stints put in. During the procedure the doctor decides which stent to put in based on which one is on hand at the time.
a. Is this an example of a randomized experiment?
b. Why or why not?
3?. In a weight control program research, one group is told to exercise and one group is told to not exercise.
a. Is this a blind experiment, double blind experiment, or neither?
b. Why?
4?. A STAT 200 instructor is interested in the average weekly study time for UMUC STAT 200 students. She teaches two sections in Fall OL1, and randomly chooses 15 students from the first section and 18 students from the second section.
a. What is this sampling method? Cluster, convenience, stratified, or systematic?
b. Why?
5.? Students in a statistics class took their first test. The following table lists the scores they earned.
| 67 |
67 |
76 |
47 |
85 |
70 |
| 87 |
76 |
67 |
72 |
84 |
98 |
| 84 |
64 |
65 |
82 |
81 |
81 |
Attachment:- Answer Sheet.rar