5.2.1: Exercises
- Page ID
- 85093
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- A political scientist surveys 28 of the current 106 representatives in a state's congress. Of them, 14 said they were supporting a new education bill, 12 said there were not supporting the bill, and 2 were undecided.
- What is the population of this survey?
- What is the size of the population?
- What is the sample of this survey?
- Find the sample statistic for the proportion of representatives surveyed who said they were supporting the education bill.
- Based on this sample, we might expect how many of the representatives to support the education bill?
- The city of Raleigh has 9500 registered voters. There are two candidates for city council in an upcoming election: Brown and Feliz. The day before the election, a telephone poll of 350 randomly selected registered voters was conducted. 112 said they'd vote for Brown, 207 said they'd vote for Feliz, and 31 were undecided.
- What is the population of this survey?
- What is the size of the population?
- What is the sample of this survey?
- Find the sample statistic for the proportion of voters surveyed who said they'd vote for Brown.
- Based on this sample, we might expect how many of the 9500 voters to vote for Brown?
- A community college wants to determine how old its 30,000 students are. Officials use student records to conclude that the mean age of students enrolled at the college is 28.2.
- What is the population of this survey?
- What is the size of the population?
- Is this a census or a sample?
- Is the mean of 28.2 a statistic or a parameter?
- Is the conclusion part of descriptive or inferential statistics?
- Officials at the same community college also want to know how many of its students work at least 20 hours a week. They survey 120 students at random. 59% of those surveyed say they work at least 20 hours a week. They conclude that 59% of all the students enrolled at the college work at least 20 hours a week.
- What is the population of this survey?
- What is the sample of this survey?
- What is the size of the sample?
- Is 59% a statistic or a parameter?
- Is the conclusion part of descriptive or inferential statistics?