Soccer regulations are that the ball be an air-filled sphere with a circumference of 68-70 cm,...

Soccer regulations are that the ball be an air-filled sphere with a circumference of 68-70 cm, and a mass of 410-450 g. The 2010 FIFA world cup “Jabulani” ball had a circumference of 69 cm and a mass of 440 g. This ball is also specified to have 0% water absorption. The ball is kicked into a deep puddle; what fraction of the volume of this ball floats above the surface of the water?

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genius_generous answered 2 years ago

1.A soccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.05 in....

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A soccer ball manufacturer wants to estimate the mean circumference of mini-soccer balls within 0.05 inch....

A soccer ball manufacturer wants to estimate the mean circumference of mini-soccer balls within 0.05 inch. Assume the population of circumferences is normally distributed. (a) Determine the minimum sample size required to construct a 95% confidence interval for the population mean. Assume the population standard deviation is 0.25 inch. (b) Repeat part (a) using a population standard deviation of 0.35 inch. (c) Which standard deviation requires a larger sample size? Explain

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