Description
See attached pages.
Do questions 7, 9, 10, 15,. 20 and 22
Note: question 22 has C also on page 343
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Explanation & Answer
Attached.
Question 7:
a) The point estimate of the population mean is given by
1
( 5 + 8 + 10 + 7 + 10 + 14 )
6
1
= ( 54 )
6
=9
=
b) The point estimate of the population standard deviation is given by
N
=
( x − )
i =1
2
i
N
( 5 − 9 ) + (8 − 9 ) + (10 − 9 ) + ( 7 − 9 ) + (10 − 9 ) + (14 − 9 )
2
=
=
2
2
2
2
6
( −4 ) + ( −1)
2
=
2
2
+ 12 + ( −2 ) + 12 + 52
6
2
16 + 1 + 1 + 4 + 1 + 25
6
=2 2
Question 9:
a) A point estimate of the population mean numbers of units sold per month is given by
1
( 94 + 100 + 85 + 94 + 92 )
5
1
= ( 465 )
5
= 93
=
b) A point estimate of the population standard deviation is calculated by
N
=
( x − )
i =1
2
i
N
( 94 − 93) + (100 − 93) + (85 − 93) + ( 94 − 93) + ( 92 − 93)
2
=
=
2
2
2
2
5
1 + 49 + 64 + 1 + 1
5
= 4.817
Question 10:
a) The point estim...
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