Recall that a bank manager has developed a new system to reduce the time customers spend waiting to be served by tellers during peak business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10 minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean of the sample of 91 bank customer waiting times is x=5.41. If we let denote the mean of all possible bank customer waiting times using the new system and assume that equals 2.42: Calculate 99 percent confidence intervals for . (Round your answers to 3 decimal places.) [3.757, 4.063] [6.757, 8.063] [4.757, 6.063] [5.757,7.063] Recall that a bank manager has developed a new system to reduce the time customers spend waiting to be served by tellers during peak business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10 minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean of the sample of 91 bank customer waiting times is x=5.41. If we let denote the mean of all possible bank customer waiting times using the new system and assume that equals 2.42: Using the 99 percent confidence interval, can the bank manager be 99 percent confident that is less than six minutes? Explain. No, the 99% interval contains some kind of average mean other than 6. Yes, the 99\% interval extends above mean 6 No, the 99% interval extends above mean 6 Yes, the 99% interval extends below mean 6 Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30 -gallon bags that are currently on the market have a mean breaking strength of 50 pounds or more. On the basis of these results, the producer of the new, improved trash bag feels sure that its 30gallon bag will be the strongest such bag on the market if the new trash bag's mean breaking strength can be shown to be at least 50 pounds. The mean of the sample of 39 trash bag breaking strengths in Table 1.10 is x=50.573. If we let denote the mean of the breaking strengths of all possible trash bags of the new type and assume that equals 1.61: Calculate 95 percent confidence intervals for . (Round your answers to 3 decimal places.) [51.068, 41.078] [50.068, 51.078] [39.068,49.078] [61.068, 11.078] Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30 -gallon bags that are currently on the market have a mean breaking strength of 50 pounds or more. On the basis of these results, the producer of the new, improved trash bag feels sure that its 30 gallon bag will be the strongest such bag on the market if the new trash bag's mean breaking strength can be shown to be at least 50 pounds. The mean of the sample of 39 trash bag breaking strengths in Table 1.10 is x=50.573. If we let denote the mean of the breaking strengths of all possible trash bags of the new type and assume that equals 1.61: Using the 95 percent confidence interval, can we be 95 percent confident that is at least 50 pounds? Yes, because 95% interval is above 50 . Yes, because 95% interval is some kind of mean 50. Yes, because 95% interval is may be 50 Yes, because 95% interval is lower than 50. Recall that a bank manager has developed a new system to reduce the time customers spend waiting to be served by tellers during peak business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10 minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean of the sample of 91 bank customer waiting times is x=5.41. If we let denote the mean of all possible bank customer waiting times using the new system and assume that equals 2.42: Calculate 99 percent confidence intervals for . (Round your answers to 3 decimal places.) [3.757, 4.063] [6.757, 8.063] [4.757, 6.063] [5.757,7.063] Recall that a bank manager has developed a new system to reduce the time customers spend waiting to be served by tellers during peak business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10 minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean of the sample of 91 bank customer waiting times is x=5.41. If we let denote the mean of all possible bank customer waiting times using the new system and assume that equals 2.42: Using the 99 percent confidence interval, can the bank manager be 99 percent confident that is less than six minutes? Explain. No, the 99% interval contains some kind of average mean other than 6. Yes, the 99\% interval extends above mean 6 No, the 99% interval extends above mean 6 Yes, the 99% interval extends below mean 6 Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30 -gallon bags that are currently on the market have a mean breaking strength of 50 pounds or more. On the basis of these results, the producer of the new, improved trash bag feels sure that its 30gallon bag will be the strongest such bag on the market if the new trash bag's mean breaking strength can be shown to be at least 50 pounds. The mean of the sample of 39 trash bag breaking strengths in Table 1.10 is x=50.573. If we let denote the mean of the breaking strengths of all possible trash bags of the new type and assume that equals 1.61: Calculate 95 percent confidence intervals for . (Round your answers to 3 decimal places.) [51.068, 41.078] [50.068, 51.078] [39.068,49.078] [61.068, 11.078] Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30 -gallon bags that are currently on the market have a mean breaking strength of 50 pounds or more. On the basis of these results, the producer of the new, improved trash bag feels sure that its 30 gallon bag will be the strongest such bag on the market if the new trash bag's mean breaking strength can be shown to be at least 50 pounds. The mean of the sample of 39 trash bag breaking strengths in Table 1.10 is x=50.573. If we let denote the mean of the breaking strengths of all possible trash bags of the new type and assume that equals 1.61: Using the 95 percent confidence interval, can we be 95 percent confident that is at least 50 pounds? Yes, because 95% interval is above 50 . Yes, because 95% interval is some kind of mean 50. Yes, because 95% interval is may be 50 Yes, because 95% interval is lower than 50