At 5% level of significance, what can you conclude about the average highest recorded wind speed of the strongest typhoons entering the country after 1960?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
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Chapter1: Starting With Matlab
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Are the typhoons entering the country becoming increasingly 
stronger? Records of PAGASA show that from 1947 to 1960, the 
strongest typhoons to hit the Philippines had an average highest 
recorded wind speed of 240 kilometers per hour (km/h). A 
random sample of the 17 strongest typhoons to hit the country 
after 1960 reported an average highest recorded wind speed of 
239 km/h with a standard deviation of 28 km/h. Assume that the 
highest recorded wind speeds follow the normal distribution. At 
5% level of significance, what can you conclude about the 
average highest recorded wind speed of the strongest typhoons 
entering the country after 1960?

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