please help I don\'t understand questions For Exercises 9-11, identify the type
ID: 3376423 • Letter: P
Question
please help I don't understand questions
For Exercises 9-11, identify the type of study method described in each situation and explain whether the sample statistics can be used to make a general conclusion about the population. 9. A list of students is randomly generated from the school database. Information for every student is entered into the database, and each student has an equally likely chance of being selected. The students selected are asked how much time they spend on household chores each week 10. The local librarian collects data about the types of books that are checked out so that she can place a new book order accordingly. She records the type of book checked out by every other person each day for three weeks. 11. Gardening A gardener tests a new plant food by planting seeds from the same package in the same soil and location. Each plant is given the same amount of water, but one plant is given food and the other is given no food at all. He records the growth and flowering rates of each plant. 12. a. Energy what sampling method could you use to find the percent of adults in S your community who support building more nuclear power plants? b. What is an example of a survey question that is likely to yield unbiased information?Explanation / Answer
9.
survey; The results are reliable since a random sample was used.
10.
Observational study; the statistics are somewhat unreliable in this study because not all library goes have an equally likely chance of being selected. Although the data collected cannot be used to make a general conclusion about the entire population, it may still give the librarian useful information to make her decision.
11.
Controlled experiment; the statistics from this study can be used to make a general conclusion about the effectiveness of the plant food for this particular plant type as compared with giving no plant food at all.
12. a. systematic sampling; call every 50th listing in the local phone book
b. Check students’ work
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