Suppose a random sample of 1,087 eighth graders found that 570 of them drank two or more caffeinated drinks a day. (a) State the 96% confidence interval. Round to four decimal places. (b) Interpret the 96% confidence interval. (c) Is there evidence to suggest that greater than 50% of eighth graders drink two or more caffeinated drinks in a day at the 5% level of significance?

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Ответ:

dudeper40

11.03.2022

Mathematics

we have

$-c+2d=13$ > equation a

$-9c-4d=-15$ > equation b

multiply by $2$ equation a

$2(-c+2d)=2*13$

$-2c+4d=26$ > equation c

adds equation b and equation c

$-9c-4d=-15\\-2c+4d=-9c-2c=-15+26 \\ -11c=11\\c=-1$

find the value of d

)+2d=13[/tex]

$2d=13-1$

$d=6$

therefore

the answer is

the solution is the point $(-1,6)$

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