Results 1 to 5 of 5

Math Help - Basic Statistics. Need to double check and need some answers

  1. #1
    Junior Member
    Joined
    Apr 2006
    Posts
    39

    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?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Apr 2006
    Posts
    39

    Can some1 reply

    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
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by darren_a1 View Post
    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
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    Apr 2006
    Posts
    39
    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
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by darren_a1 View Post
    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
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Can someone check my answers
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 21st 2009, 02:50 AM
  2. Could someone check my answers pls.
    Posted in the Algebra Forum
    Replies: 2
    Last Post: August 6th 2009, 11:06 PM
  3. check my answers plz
    Posted in the Calculus Forum
    Replies: 3
    Last Post: February 28th 2009, 06:06 PM
  4. I need someone to check my answers.
    Posted in the Algebra Forum
    Replies: 2
    Last Post: July 30th 2008, 05:34 AM
  5. Please check my answers
    Posted in the Calculus Forum
    Replies: 5
    Last Post: March 2nd 2006, 04:44 AM

Search Tags


/mathhelpforum @mathhelpforum