3 years ago

Isabel lives 2 7/9 miles from school. Janet lives 2 5/7 miles from school. Who lives farther away from school? How do you know?

Mathematics

1 answer:

mash [69]3 years ago

4 0

Isabel. Because 7/9 is bigger than 5/7 . 7/9 is equivalent to 0.77 and 5/7 is equivalent to 0.71

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Answer: The test statistic is t= -0.90.

Step-by-step explanation:

Since we have given that

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So, s would be

$s=\sqrt{\dfrac{n_1\sigma_1^2+n_2\sigma_2^2}{n_1+n_2-2}}\\\\s=\sqrt{\dfrac{50\times 0.08^2+25\times 0.06^2}{50+25-2}}\\\\s=0.075$

So, the value of test statistic would be

$t=\dfrac{\bar{x_1}-\bar{x_2}}{s(\dfrac{1}{n_1}+\dfrac{1}{n_2})}\\t=\dfrac{3.02-3.04}{0.074(\dfrac{1}{50}+\dfrac{1}{25})}\\\\t=\dfrac{-0.04}{0.074(0.02+0.04)}\\\\t=\dfrac{-0.04}{0.044}\\\\t=-0.90$

Hence, the test statistic is t= -0.90.

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