jennifer9983
24.10.2019 •
Mathematics
Lori jeffrey is a successful sales representative for a major publisher of college textbooks. historically, lori obtains a book adoption on 25% of her sales calls. viewing her sales calls for one month as a sample of all possible sales calls, assume that a statistical analysis of the data yields a standard error of the proportion of .0625.a. how large was the sample used in this analysis? that is, how many sales calls did lori make during the month? b. let p¯ indicate the sample proportion of book adoptions obtained during the month. show the sampling distribution of p¯.c. using the sampling distribution of p¯, compute the probability that lori will obtainbook adoptions on 30%or more of her sales calls during a one-month period.
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Ответ:
see the attachment
Step-by-step explanation:
It helps to follow along the proof and consider how you get from here to there.
In the 5th line, we have a sum in symbols.
In the 7th line, we have an expression with a number on the right side, and a statement that says we got there by subtraction.
Then we expect line 6 to have a sum with numbers whose difference is 40°. (That eliminates the 3rd and 4th choices.)
The way you get from an expression with symbols to an expression with numbers is to make a substitution of numbers for symbols. Hence the appropriate choice is the one shown below.