sotoamerica0814
18.04.2020 •
Mathematics
A researcher wants to estimate the number of teachers who have changed careers after their first year of teaching. How many 1st year teachers does he need to sample in order to be 95% confident that his estimate for the mean number of teachers will be within 3 teachers of the true mean? The standard deviation is 2 teachers.
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Ответ:
10
Step-by-step explanation:
"three times r" = 3r
"three times r minus ten" = 3r - 10
"product of 5 and the difference of three times r minus ten"
= 5 (3r - 10)
given that r = 4,
the expression becomes
5 (3r - 10)
= 5 [3(4) - 10]
= 5 [12 - 10]
= 5 (2)
= 10