This is an exam. Whether or not the person can complete the exam means
whether or not they pass. Now i may not be familiar with the English system
of education but if we answer this question for this person, has he/she
learned anything. I can either answer the question and know that someone who
does not understand statistics passes an exan that says he/she does or I can
launch into a two page e-mail to teach them what they should have learned in
their course in the first place. I choose to do neither. I agree with the
other poster that this list is not the approriate place for this kind of
question. We get these kind all the time on my ed stat list as well. it is
typically people who don't want to bother figuring something out for
themselves. That is why there are courses taught and labs and tutors.
Paul R. Swank, Ph.D.
Professor, Developmental Pediatrics
Medical School
UT Health Science Center at Houston
-----Original Message-----
From: A UK-based worldwide e-mail broadcast system mailing list
[mailto:[log in to unmask]]On Behalf Of Caroline.Lynch
Sent: Tuesday, April 09, 2002 11:13 AM
To: [log in to unmask]
Subject: Re: Help wanted with my a Level Stats project pleeeses!
Might I suggest that he already tried the book? Haven't you ever read a book
you didn't understand? I was always led to believe that if you don't
understand something, you should ask someone who might be able to help you!
Caroline Lynch
University of Limerick
-----Original Message-----
From: Paul R Swank [mailto:[log in to unmask]]
Sent: 09 April 2002 16:43
To: [log in to unmask]
Subject: Re: Help wanted with my a Level Stats project pleeeses!
All I can say is that if you can't solve that problem you need to go back to
the book.
Paul R. Swank, Ph.D.
Professor, Developmental Pediatrics
Medical School
UT Health Science Center at Houston
-----Original Message-----
From: A UK-based worldwide e-mail broadcast system mailing list
[mailto:[log in to unmask]]On Behalf Of bryanjeanes
Sent: Tuesday, April 09, 2002 8:53 AM
To: [log in to unmask]
Subject: Help wanted with my a Level Stats project pleeeses!
Hello everybody, I am trying without much success to complete my A level
course work and I would be extremely appreciative and grateful if
anybody on the Allstat list would be kind enough to give up a few
minutes of their precious time to help me. I appreciate that your time
is very valuable so I will post the two types of problem with which I am
having difficulty with the hope that somebody will have the time to help
me. Yours hopefully, Bryan Jeanes, 17, Crosskeys College of F.E.
Newport, Gwent.
1. A local community was concerned about the speed of commercial traffic
in a residential area where the speed limit is set at 48km/h (30mph). A
survey showed that the average speed of commercial vehicles was 54km/h
and the standard deviation was 9.5km/h. The distribution of speeds
approximated that of the normal distribution.
(a) What percentage of commercial vehicles exceed the speed limit?
(b) What percentage of vehicles exceed 72km/h (45mph)?
(c) Between what speeds does the in interquartile range (the middle 50%)
fall?
2. A survey using a sample of 56 customers of a courier company revealed
that 72% were highly satisfied with the timing of their deliveries.
Using the 95% confidence interval, calculate the percentage range of the
population of customers who were highly satisfied.
(b) What sample size would be required to achieve a level of accuracy
within the population of plus or minus 3%?
I hope that somebody will be able to help, Cheers, Bryan.
PS, These are not the exact questions as I don't want the work done for
me , I just want worked answers to similar questions so that I can
follow the procedures and formulas to answer the actula problems on my
paper. To these ends I have posted two problems that are broadly similar
to the ones that I am having difficulty with. Thanks.
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