The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Courses » ap-stat

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: stats quiz question
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  
Pat Ballew

Posts: 356
Registered: 12/3/04
stats quiz question
Posted: Nov 4, 1996 8:17 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Several people have written me personally with good adaptations of the
problem I sent a few days ago, some I thought worth sharing:

The original problem:
3) A set of 11 data values has a mean of 8 and a std dev of 2. At
least one of the data items is the value 8. If this value is removed,
without replacement from the data set, what will be the std dev of the
remaining data? Show all work or calculator entry and results.

Option 1: Same given but offer multiple choice responses
a) St dev increases; b) decreases, C) is unchanged D) Insufficient

Option 2) If a value of 12 is removed what is the impact (with
same multiple choice answers)

Option 3) given numbers 8, 10, and 12, which could be removed and
have the least impact on the STdev

Thanks for all the great ideas

Pat Ballew
Misawa, Japan

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.