# Thread: Basic Statistics. Need to double check and need some answers

1. ## Basic Statistics. Need to double check and need some answers

Here are more questions that I need some help with - I came up with some of the answers but need to double check them. My answers are the ones in bold text.

5. Customer satisfaction scores at a local store have a mean of 42.95 and a standard deviation of 2.642. Find the z-score associated with a satisfaction score of 46.3. (Round to two decimal places.) [(46.3-42.95)/2.642)] = 1.27

6. You will be asked to determine if a satisfaction score of 46.3 is unusual in a population having a mean score of 42.95 and a standard deviation of 2.642 based on the z-score calculated in #5. No ….why?

7. Customer satisfaction scores at a local store have a mean of 42.95 and a standard deviation of 2.642. Find the z-score associated with a satisfaction score of 36.8. (Round to two decimal places.)
[(36.8-42.95)/2.642)] = (-2.33)

8. You will be asked to determine if a satisfaction score of 36.8 is unusual in a population having a mean score of 42.95 and a standard deviation of 2.642 based on the z-score calculated in #7. NO why?

9. Which employee group has the higher relative efficient rating: Group A with a rating of 85.7 in a population with a mean rate of 77.53 and a standard deviation of 15.2 or Group B with a rate of 15.3 in a population with a mean rate of 12.75 and a standard deviation of 1.4?

10. Which trash bag – regular or heavy duty – has a higher relative breaking strength: Bag A that breaks at 47.8 lbs and is a regular bag of which all have a mean breaking strength of 50.57 lbs and a standard deviation of 1.643 lbs or Bag B that breaks at 62.3 lbs and is a heavy duty bag of which all have a mean breaking strength of 65.43 lbs and a standard deviation of 2.271 lbs?

hi guys.. i got most of the answers - could some1 please reply to the last 2 questions?

I really need the answers for those!

THanks

Darren

3. Originally Posted by darren_a1
9. Which employee group has the higher relative efficient rating: Group A with a rating of 85.7 in a population with a mean rate of 77.53 and a standard deviation of 15.2 or Group B with a rate of 15.3 in a population with a mean rate of 12.75 and a standard deviation of 1.4?

10. Which trash bag – regular or heavy duty – has a higher relative breaking strength: Bag A that breaks at 47.8 lbs and is a regular bag of which all have a mean breaking strength of 50.57 lbs and a standard deviation of 1.643 lbs or Bag B that breaks at 62.3 lbs and is a heavy duty bag of which all have a mean breaking strength of 65.43 lbs and a standard deviation of 2.271 lbs?
Both of these just want you to compare the z-scores of the two cases.

RonL

4. yes sir!

but does a higher z-score indicate better efficiency and higher breaking strength in the respective cases?

my classes are online and my teacher is a pain in the ...... won;t help or do anything - sorry to keep bothering!

thanks

Darren

5. Originally Posted by darren_a1
yes sir!

but does a higher z-score indicate better efficiency and higher breaking strength in the respective cases?

my classes are online and my teacher is a pain in the ...... won;t help or do anything - sorry to keep bothering!

thanks

Darren

Higher z-score in both cases is better. (this is of course a relative measure it is relativly better with repect to the statistics of its type)

RonL