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barxatty [35]
3 years ago
5

Caleb bought some new coats. They are normally priced at $20.00 however they are now 31% off. How much did Caleb pay for the coa

ts?
Mathematics
2 answers:
Nadya [2.5K]3 years ago
7 0
$13.49 is the answer to your question
Usimov [2.4K]3 years ago
3 0
20 * (31/100) = 21*0.31=6.51
20.00-6.51=13.49

Caleb paid $13.49
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Answer:

Null and alternative hypotheses:

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p'1 = \frac{x_1}{n_1} = \frac{113}{3180} = 0.0355

p'2 = \frac{x_2}{n_2} = \frac{157}{3168} = 0.0495

p' = \frac{(x_1 + x_2}{n_1 + n_2} = \frac{113 + 157}{3180 + 3168} = 0.0425

Calculate Z statistics:

z = \frac{(p1 -p2)}{\sqrt{(p'(1-p')*(\frac{1}{n1}+ \frac{1}{n2})}}

= \frac{(0.0355 - 0.0495)}{\sqrt{(0.0425*(1-0.0425) * (\frac{1}{3180} + \frac{1}{3168})}} = -2.764

Z = -2.764

P-value = 0.00285

The pvalue is low.

Since the pvalue is low, reject null hypothesis, H0.

Conclusion:

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