Answer: c. 3.01
Step-by-step explanation:
The test statistic for difference between two population mean (when population standard deviation is known) is given by :
, where 
= Size of first sample
= Size of second sample
= Difference between two sample mean.
= standard deviation for population 1.
= standard deviation for population 2.
As per given , we have
Substitute these values in formula , we get
Hence, the value of the test statistic is <u>3.01</u>.
Hence, the correct option is c. 3.01 .
There are 45 numbers between 49 and 95
Numbers in the fifties: 50,51,52,53,54,55,56,57,58,59
Numbers in the sixties: 60,61,62,63,64,65,66,67,68,69
Numbers in their seventies: 70,71,72,73,74,75,76,77,78,79
Numbers in their eighties: 80,81,82,83,84,85,86,87,88,89
Numbers in their nineties: 90,91,92,93,94
Multiples of 2:
50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94
Multiples of 3:
51,54,57,60,63,66,69,72,75,78,81,84,87,90
Multiples of 9:
54,63,72,81,90
Notice that all multiples of nine are also multiples of three? That is because three is a factor of nine
