cogger9348
28.04.2021 •
Mathematics
A nurse is investigating the birth weights of non-premature babies. She selects a random sample of 41 such babies, and found a mean weight of 3506.4 grams and a sample standard deviation of 494.2 grams. Find a 95% confidence interval for the mean birth weight of all non-premature babies. Show your calculation for the confidence interval as well as the final confidence interval rounded to one decimal place. Then write a sentence that gives the interpretation of your confidence interval, including the correct units.
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Ответ:
Step-by-step explanation:
Take x common
x(20x²+22x+6)=0
20x²+22x+6 = 0
20x²+10x+12x+6=0
10x(2x+1)+6(2x+1)=0
(10x+6) (2x+1) are the factors
x= -6/10 and -1/2