The population of the United States is approximately 3 x 10° people. The population of G O The population of Germany is almost 3 times the population of O The population of Germany is almost 4 times the population of The population of the United States is almost 3 times the popula O The population of the United States is almost 4 times the popula

A charity benefit is attended by 30 people and three gift certificates are given away as door prizes.  One gift certificate is in the amount of $50, the second is worth $30 and the third is worth $20.  Assuming that no person wins more than one prize, how many different ways can the three gift certificates be awarded? ANSWER__________ WORK___________

Length of a rod: Engineers on the Bay Bridge are measuring tower rods to find out if any rods have been corroded from salt water. There are rods on the east and west sides of the bridge span. One engineer plans to measure the length of an eastern rod 25 times and then calculate the average of the 25 measurements to estimate the true length of the eastern rod. A different engineer plans to measure the length of a western rod 20 times and then calculate the average of the 20 measurements to estimate the true length of the western rod. Suppose the engineer who collected 25 measurements for the eastern rod has a mean length of 23.9 feet with a standard deviation of 0.5 feet. The critical T-value for a 90% (one-sample) confidence interval with df = 24 is T=1.71. Which of the following is the resulting 90% confidence interval?  (23.73 , 24.07)  (23.05, 24.76)  (23.80, 24.00)

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