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Flura [38]
2 years ago
15

A used bookstore will trade 2 of its books for 3 of yours if Val brings in 18 books to trade how many books can she get from the

store
Mathematics
1 answer:
Sveta_85 [38]2 years ago
3 0
We have an equation: ?/18 = 2/3

Cross multiply:
3*? = 2*18
⇒ ?= 2*18/3= 12.

Val can get 12 books from the store~
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Answer:

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Step-by-step explanation:

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Grades on a standardized test are known to have a mean of 1000 for students in the United States. The test is administered to 45
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Answer:

a

The 95% confidence interval is 1003  <  \mu

b

Yes there is statistically significant evidence that students in Florida perform differently from other students in the United States

Step-by-step explanation:

From the question we are told that

   The population mean is  \mu =  1000

   The sample size is  n =  453

   The sample mean is  \= x  = 1013

    The standard deviation is s =  108

   

Given that the confidence level is  95% then the level of significance is mathematically represented as

            \alpha  =  100 - 95

=>         \alpha  =  5\%

=>          \alpha  = 0.05

The critical value  for \frac{\alpha }{2} obtained from the normal distribution table is          

          Z_{\frac{\alpha }{2} } =  1.96

Generally the margin of error is mathematically represented as

         E =  Z_{\frac{\alpha }{2} } *  \frac{s}{\sqrt{n} }

=>     E =  1.96 *  \frac{108}{\sqrt{453} }

=>      E = 9.946

Generally the 95% confidence interval is mathematically represented as

           \= x  - E  <  \mu <  \= x + E

=>         1013  - 9.946  <  \mu < 1013  + 9.946

=>         1003  <  \mu

Given that the population mean(1000) is not within the 95% confidence interval for l for the average test score for students in Florida, then it means that there is statistically significant evidence that students in Florida perform differently from other students in the United States

 

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Step-by-step explanation:


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Step-by-step explanation:

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