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An advocacy group claims that the mean braking distance of a certain type of tire is 75 feet when the car is going 40 miles
An advocacy group claims that the mean braking distance of a certain type of tire is 75 feet when the car is going 40 miles per hour. In a test of 45 of these tires, the braking distance has a mean of 77 and a standard deviation of 5.9 feet. Find the standardized test statistic and the corresponding p-value.
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z-test statistic = 2.27, p-value = 0.0115
z-test statistic = -2.27, p-value = 0.0230
z-test statistic = -2.27, p-value = 0.0115
z-test statistic = 2.27, p-value = 0.0230
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