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Data Mining Assignment

Autor:   •  October 7, 2015  •  Exam  •  686 Words (3 Pages)  •  756 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

Answer:

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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