2.The expense of moving the storage yard for the Consolidated Package Delivery Services (CPDS) is justice only if it can be shown that the daily mean travel distance will be less than 350 km. In trial runs of 18 randomly chosen delivery trucks, the mean and the standard deviation are found to be 310 km and 70km, respectively. Assume that the daily travel distance is normally distributed. At the 0.01 level of significance, test the claim that the daily mean travel distance is less than 350 km. What is the CONCLUSION?

A. there is sufficient sample evidence to support the claim that the daily mean travel distance is less than 350 km.

B. there is insufficient sample evidence to support the claim that the daily mean travel distance is less than 350 km.

C. there is sufficient sample evidence to support the claim that the daily mean travel distance is more than 350 km.

D. there is insufficient sample evidence to support the claim that the daily mean travel distance is more than 350 km.

E. there is not enough assumptions to do a hypothesis test in this case

Q3. . To test that the population variance is less than 12 at the 0.10 level of significant, we collect a sample of size 20. What is the critical Chi-Square value?

A. 11.7

B. 13.2

C. 27.2

D. 29.6

E. None of the other answers is true.

Q4. A latest product of a cat food manufacturer is apparently well liked and nutritious, but cans are reportedly going bad before the end of their states shelf life. Test are now being conducted with an improved product using revised set of additives. Based on the accompanying results, and using a 0.05 level of significance, test the claim that the shelf life of their products is independent of the additives that are used.

Below Standard Acceptable Above Standard

Current Additives 34 25 5

Revised Additives 7 44 10

1. Fail H0; that shelf life is independent of additives used
2. RejectH1,that shelf life is not independent of additives
3. RejectH0,that shelf life is independent of the additives used
4. None of the above

Q5. A study to investigate the relationship between hearing loss and age produced the followingdata on "comfortable" sound level for 8 people of different ages

Age 15 25 35 45 55 65 75 85 (yrs.)

SoundLevel 56 57 64 64 68 74 78 85 (decibels)

The regression equation, and the age when the sound level is 80 decibels is

1. y= 0.5x + 49.0, 78yrs
2. y= 0.4x + 48.0, 80yrs
3. y= 0.3x + 47.0, 71yrs
4. y= 0.4x + 58.0, 77yrs