Form 6: Comparing Two Population Inferences

Questions

1. MultiChoice

   Random samples show Grade 7 students spend a mean of 5 hours/week on homework, while Grade 8 students spend a mean of 4 hours/week. What inference is supported?

2. MultiChoice

   A random sample from School A has a mean of 10 books read/year. School B's sample has a mean of 7 books read/year. What inference is valid?

3. MultiChoice

   Random samples from Class X (IQR = 15) and Class Y (IQR = 6) are compared. What can be inferred about the variability of scores?

4. MultiChoice

   Store A sample mean item price is $25; Store B sample mean is $20. Both samples are random and size 50. What inference is supported?

5. MultiChoice

   Sample statistics: Team 1 Mean = 50, Range = 10. Team 2 Mean = 50, Range = 30. What inference is valid about consistency?

6. MultiChoice

   In a random sample, 60% of Group A exercises in the morning versus 40% of Group B. What inference can be made?

7. MultiChoice

   Sample mean life for Brand X is 40 hours; for Brand Y it is 32 hours. What can be inferred about the populations?

8. MultiChoice

   Grade 6 sample height MAD = 2.5 inches; Grade 7 sample height MAD = 4.1 inches. What inference is supported?

9. MultiChoice

   Suburban sample mean = 2.1 pets/household; Urban sample mean = 1.2 pets/household. What inference is valid?

10. MultiChoice

    Two teaching methods were tested with random samples. Method A mean gain = 12 points; Method B mean gain = 7 points. Infer which method was more effective.

11. MultiChoice

    Town 1 sample recycling rate = 45%; Town 2 sample recycling rate = 68%. What inference is supported?

12. MultiChoice

    When comparing two random sample distributions, what does significant overlap of data points suggest?