# Data Mining Assignment

Autor:   •  October 7, 2015  •  Exam  •  686 Words (3 Pages)  •  812 Views

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(QMT758)

ASSIGNMENT 1

Name: Norsyuhada Binti Johan

Matrix No: 2014260284

Lecturer’s Name: Halilah Haron (Assoc. Prof.)

Question 4.28

An auditor detects that a certain firm is regularly overstating the dollar amounts of inventories because of delays in recording withdrawals. The auditor wants to estimate the total overstated amount on 1000 listed items by obtaining exact (audited) inventory amounts on a random sample of 15 items and comparing these exact figures with the recorded amounts. The data for the sampled items are as shown in the following table. Estimate the total overstated amount on the 1000 items and place a bound on the error of estimation.

 Item No Audited amount (\$) Recorded amount (\$) Overstatement (diff, \$) 1 175 210 35 2 295 305 10 3 68 91 23 4 74 82 8 5 128 140 12 6 241 250 9 7 362 384 22 8 72 80 8 9 59 82 23 10 112 140 28 11 118 124 6 12 210 230 20 13 240 260 20 14 123 147 24 15 96 108 12

By using scientific calculator, get the value of   and  [pic 1][pic 2]

n=15

N=1000

=17.333[pic 3]

=75.238[pic 4]

τ = Total overstated amount

[pic 5]

[pic 6]

[pic 7]

A 95% for τ

= [pic 8]

= [pic 9]

= [pic 10]

Question 4.38

What is the average body temperature under normal conditions? Is it the same for both men and women? Medical researchers interested in this question collected data from a large number of men and women. Two random samples from that data, each of size 10, are recorded. Estimate the mean body temperature of men with a two standard deviation margin of error.

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