Homework 1

Question 11

A study is under way to determine the average height of all 63,000 adult walnut trees in a certain national forest. The heights of 950 randomly selected adult walnut trees are measured and analyzed. The sample in this study is: O a. the average height of all the adult walnut trees in this forest. O b. the average height of the 950 randomly selected adult walnut trees. O c. all the adult walnut trees in this forest. O d. the 950 adult walnut trees selected at random from this forest.A councilman who is running for the office of senator of a state with 3.5 million registered voters commissions a survey. In the survey, 46% of the 8,000 registered voters interviewed say they plan to vote for him. The population of interest is: a. the 3.5 million registered voters in the state. O b. all the residents of the state. O c. the 8,000 registered voters interviewed. O d. the 46% who plan to vote for her.Question 14 In constructing a frequency distribution, as the number of classes is decreased, the class width O a. can increase or decrease depending on the data values O b. increases O c. remains unchanged O d. decreasesTwenty-five participating in a recent election exit poll in Minnesota were asked to state their political party affiliation. Coding the data as R for Republican, D for Democrat, and I for Independent, the data collected were given in Voters.xlsx Construct a frequency bar chart from this data. Which candidate came in the second place in terms of number of votes? O a. Republican O b. Not enough information is given O c. Independent O d. DemocratA researcher at Florida International University (FIU) wants to estimate the average number of credits earned by students last semester at FIU. She randomly selects 750 students from last semester and finds that they averaged 13.75 credits per student. The population of interest to the researcher is: O a. all college students. O b. the 750 FIU students selected at random. O c. all FIU students. O d. all FIU students enrolled last semester