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Katyanochek1 [597]
2 years ago
5

In one day, the stock price for Warbucks Coffee rose from $50 to $57 per share. By what percent did this stock price rise?

Mathematics
1 answer:
egoroff_w [7]2 years ago
7 0

Answer:

14%

Step-by-step explanation:

1. The formula to find percent change is \frac{(V_2-V_1)}{|V_1|} * 100. Now, all we have to do is plug in the values to their corresponding variable.

2. (Solving)

  • \frac{(57-50)}{|50|} * 100
  • \frac{7}{50} *100
  • 0.14 * 100
  • 14%
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Answer:

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Now we can calculate the p value. Since is a bilateral test the p value would be:  

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Step-by-step explanation:

Information given

n=900 represent the random sample selected

\hat p=0.75 estimated proportion of residents favored annexation

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p_v represent the p value

Hypothesis to test

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The statistic for this case is given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Replacing the data given we got:

z=\frac{0.75 -0.72}{\sqrt{\frac{0.72(1-0.72)}{900}}}=2.00  

Now we can calculate the p value. Since is a bilateral test the p value would be:  

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Since the p value is lower than the significance level of 0.05 we have enough evidence to conclude that the true proportion of residents favored annexation is higher than 0.72 or 72%

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