Answer :
The correct unit of measure for the mean of the sampling distribution of (pˆB - pˆC) is Workers , the correct option is (d) .
In the question ,
it is given that ,
the proportion of workers who purchase coffee from company B is = 0.62
the proportion of workers who purchase coffee from company C is = 0.71
the random sample taken from company B is = 40 workers
the random sample taken from company C is = 40 workers
we know that , a proportion is written as two equivalent fractions.
So , Each ratio compares the same units, percentage of workers purchasing the coffee in the restaurant,
hence, the unit of measure for the mean of sampling distribution is workers .
Therefore , the unit for the measurement for the mean is (d) Workers .
The given question is incomplete , the complete question is
On a given day, the proportion of workers from Company B who purchase a coffee from the company cafeteria is 0.62 and the proportion of workers from Company C who purchase a coffee from the company cafeteria is 0.71. A random sample of40 workers was selected from Company B and another random sample of 40 workers was selected from Company C. The proportion of workers from Company B who purchased coffee was pˆB=0.70 and the proportion of workers from Company C who purchased coffee was pˆC=0.75.
What is the correct unit of measure for the mean of the sampling distribution of pˆB - pˆC ?
(a) Days
(b) Dollars
(c) Companies
(d) Workers .
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