Questionss :

1.) Tests of older baseballs showed that when dropped 24 ft onto a concrete surface, they bounced an average of 235.8 cm. In a test of 40 new baseballs, the bounce had a mean of 235.4 cm. Assume the standard deviation of baseball bounce heights is 4.5 cm. At =0.05, are the new baseballs different? 2.) The totals of individual weights of garbage discarded by 62 households in one week have a mean of 27.443 lbs. Assume the standard deviation is 12.458 lbs. At =0.05, test the claim that the population mean weight of garbage is less than 30 lbs. 3.) A random sample of 26 cans of coke has a mean volume of 12.19 oz. The sample is normally distributed and has a standard deviation of 0.11 oz. At =0.01, test the claim that the cans of regular Coke have a mean volume of 12 oz.