Intro. to Statistics MCCC Ch. 1 Questions & Answers

Intro. to Statistics MCCC Ch. 1 Questions & Answers - is used when subjects are assigned to different groups through a process of random selection. - ANSWER: randomization A handler loads one item every 15 minutes, so 160 items are completed in her first week of work. Her manager checks her work by randomly selecting a day of the week, then reviewing all the items she completed that day. Does this a sampling plan result in a random sample? Simple random sample? Does this sampling plan result in a random sample? Does this sampling plan result in a simple random sample? - ANSWER: Yes, because each item has an equal chance of being selected. No, because all possible groups of n items do not have an equal chance of being selected. A particular country has 50 total states. If the areas of 20 states are added and the sum is divided by 20, the result is 205,145 square kilometers. Determine whether the result is a statistic or a parameter. - ANSWER: The result is a statistic because it describes some characteristic of a sample. A polling company reported that 14% of 2302 surveyed adults said that they play football. a. What is the exact value that 14% of 2302? b. Could the result from part (a) be the actual number of adults who said that they play football? Why or why not? c. What could be the actual number of adults who said that they play football? d. Among the 2303 respondents, 497 said that they only play hockey. What percentage of respondents said that they only play hockey? - ANSWER: a. 322.28 b. No, the result from part (a) could not be the actual number of adults who said that they play football because a count of people must result in a whole number. c. 322 d. 21.59% A polling company reported that 59% of 1013 surveyed adults said that secondhand smoke is "quite annoying." a. What is the exact value that is 59% of 1013? b. Could the result from part (a) be the actual number of adults who said that secondhand smoke is "quite annoying"? Why or why not? c. What could be the actual number of adults who said that second hand smoke is "quite annoying"? d. Among the 1013 respondents, 301 said that secondhand smoke is "not at all annoying." What percentage of respondents said that secondhand smoke is "not at all annoying"? - ANSWER: a. 597.67 b. No, the result from part (a) could not be the actual number of adults who said that secondhand smoke is "quite annoying" because a count of people must result in a whole number. c. 598 d. 29.71%