69.4 |
( a ) |
( i ) |
16.6 |
( ii ) |
3.3 |
||
( b ) |
n �
110
|
||
( b ) |
sn �
1 �
103 g
|
( c ) |
( 308.33 , 493.67 ) |
70.3 |
( a ) |
n �
25
|
( b ) |
( 19.013 , 20.987 ) |
( c ) |
1.974 |
|
70.4 |
( a ) |
n �
16
|
( b ) |
( 68.685 , 71.315 ) |
71.1 |
( a ) |
20.65 |
( b ) |
� �
2.64
|
|
71.2 |
( a ) |
3.18 |
( b ) |
sn �
1 �
0.448
|
|
71.3 |
( a ) |
A confidence interval with a smaller confidence level has a narrower interval about the mean . |
( b ) |
( 36.4 , 38.6 ) |
( c ) |
sn �
1 �
2.06
|
|
71.4 |
( a ) |
A confidence interval with a smaller confidence level has a narrower interval about the mean . |
( b ) |
( 191.6 , 204.4 ) |
72.1 |
( a ) |
( i ) |
a � 6226 , b �
2677
|
( ii ) |
30700 km |
( ii ) |
2 R �
0.748
|
||
( iii ) |
74.8 % of the |
||
variability of the data is explained by the regression model . |
|||
72.2 |
( a ) |
( i ) |
a �� 0.132 , b �
8.09
|
( ii ) |
4.79 g |
||
( ii ) |
2 R �
0.597
|
||
( iii ) |
59.7 % of the |
||
variability of the data is explained by the regression model . |
|||
72.3 |
( a ) |
( i ) |
a � 0.533 , b �
13.9
|
( ii ) |
a represents the increase in expenditure when the time spent in a market increases by 1 minute . |
||
( b ) |
( i ) |
r �
0.479
|
|
( ii ) |
2 R �
0.229
|
||
( iii ) |
22.9 % of the |
||
|
variability of the data
is explained by the regression model .
|
|||
72.4 |
( a ) |
( i ) |
a � 0.11, b ��
0.26
|
( ii ) |
b represents the annual corn yield rate when the annual rainfall is 0 cm . |
||
( b ) |
( i ) |
r �
0.957
|
|