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2 years ago

7

Winston has $200. He spends 20% of his money on a pair of shoes. how much money did he spend on the pairs of shoes?

1 answer:

masha68 [24]2 years ago

3 0

Answer:

$40

Step-by-step explanation:

200 - 20% = 160

200 - 160 = 40

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Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the pre

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Step-by-step explanation:

Since we have given that

p = 48% = 0.48

n = 115

x = 46

So, $\hat{p}=\dfrac{46}{115}=0.40$

So, hypothesis would be

$H_0:\ p=\hat{p}\\\\H_a:p$

So, test value would be

$z=\dfrac{p-\hat{p}}{\sqrt{\dfrac{p(1-p)}{n}}}\\\z=\dfrac{0.48-0.40}{\sqrt{\dfrac{0.48\times 0.52}{115}}}\\\\z=\dfrac{0.08}{0.0466}\\\\z=1.72$

At 10% level of significance, critical value would be

z= 1.28

Since 1.28 < 1.72

So, we will reject the null hypothesis.

Hence, the proportion of new car buyers that trade in their old car has statistically significantly decreased.

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3 years ago