HW9_skeleton

9.2

• 1. Decreases
• 2. True
• 3. Alpha
• 4. True
• 5. True
• 6. mu
• 1. 1.316

  2. 1.697

  3. -2.552

  4. 1.725

• 1. 2.205

  2. 1.309

  3. -1.943

  4. 2.10

• 13. Population mean=21 E=3
• 14. Population mean=25 E=5
• 1. Lower: 103.66 Upper: 112.34

  2. Lower: 100.41 Upper: 115.58 The decreasing sample size in effect increases E

  3. Lower: 104.58 Upper: 111.42 decreasing the interval decreases the margin of error

  4. No, population size too small

• 1. Flawed, This is not a probability rather, suggests that the mean varies

  2. CORRECT

  3. Flawed, It is making an assumption about individuals rather than mean

  4. It represents all adult americans, not just adults in Idaho

• 29. we are 95% confidant that the number of licks needed to reach the chocolate center of the tootsie pop is between 317.64 and 394.56
• 30. We are 99% confidant that Americans read either all or part of 12.05 to 14.75 books in the preceding year.

9.3

• 1. False
• 2. True
• 3. False
• 4. True
• 5. Chi square of .95= 10.117 Chi square of .05= 30.144
• 6. Chi square of .975= 12.401 Chi square of .025= 32.852
• 1. Lower: 7.94 Upper: 23.66

  2. lower: 8.59 Upper: 20.63 The width of the interval decreases

  3. Lower: 6.61 Upper:31.36 The width of the interval would now increase.

• 11. Lower: .226 Upper: .542 We are 95 percent confidant that the the ph of rainwater in Tucker County, west viriginia would be between .226 and .542