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ohaa [14]
3 years ago
9

Please teach me how to work this out?!

Mathematics
1 answer:
Olegator [25]3 years ago
5 0

Answer:

Step-by-step explanation:

1 hr=60 min

1 km=0.62137 miles

15 km/min=(15×60) km/hr=900 km/hr=(900×0.62137) miles /hr=559.233 miles/hr

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Answer:

z=\frac{0.64 -0.5}{\sqrt{\frac{0.5(1-0.5)}{75}}}=2.43  

Now we can calculate the p value with the following probability:

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Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true proportion for this case is higher than 0.5

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Data given and notation

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We want to verify if the true proportion is higher than 0.5:  

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The statistic is given by:

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

Replacing the info given we got:

z=\frac{0.64 -0.5}{\sqrt{\frac{0.5(1-0.5)}{75}}}=2.43  

Now we can calculate the p value with the following probability:

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