ts Proctoring Enabled: CH 8B Quiz 1 00:49:52 nces Saved A gift shop advertises that they stock 640 items that are priced under $50. A sample of Fifty-eight items are randomly selected and the sample mean price is $40, with a sample standard deviation of 10. Develop a 98% confidence interval for the population mean price. (Round the final answers to 2 decimal places.) The confidence interval is between and Help Save & Exit Submit nts Proctoring Enabled: CH 8B Quiz 2 00:49:38 rences Saved Schadek Silkscreen Printing, Inc., purchases plastic cups on which to print logos for sporting events, proms, birthdays, and other special occasions. Zack Schadek, the owner, received a large shipment this morning. To ensure the quality of the shipment, he selected a random sample of 440 cups. He found 28 to be defective. a. What is the estimated proportion defective in the population? (Round the final answer to 3 decimal places.) Estimated proportion defective b. What are the endpoints of a 80% confidence interval for the proportion defective. (Round the final answers to 3 decimal places.) Endpoints c. Zack has an agreement with his supplier that he is to return lots that are 10% or more defective. Should he return this lot? (Click to select) (Click to select) No, lot not 10% defective. Yes, 28 is outside the confidence interval. Yes, the lot is 10% defective. 4 points getproctorio.com/secure Proctoring Enabled: CH 8B Quiz 3 00:49:25 References Saved The Fox TV network is considering replacing one of its prime-time crime investigation shows with a new family-oriented comedy show. Before a final decision is made, network executives commission a sample of 400 viewers. After viewing the comedy, 250 indicated they would watch the new show and suggested it replace the crime investigation show. a. Estimate the value of the population proportion. (Round the final answer to 3 decimal places.) Estimate of proportion b. Compute the standard error of the proportion. (Round the final answer to 3 decimal places.) Standard error of the proportion c. Develop a 99% confidence interval for the population proportion. (Round the final answers to 3 decimal places.) The confidence interval is between and d. Interpret your findings. (Round the final answers to the nearest whole number.) We are reasonably sure the population proportion is between and %. 1 points Proctoring Enabled: CH 8B Quiz 4 There are 270 welders employed at the Weller Shipyards Corporation. A sample of 40 welders revealed that 30 had graduated from a registered welding course. Construct the 95% confidence interval for the proportion of all welders who graduated from a registered welding course. (Round the final answers to 3 decimal places.) The confidence interval is between and 00:49:18 References D getproctor Proctoring Enabled: CH 8B Quiz 5 Previous surveys estimated that 15% of students use the college gym. The manager would like to verify this estimate within plus or minus 0.05. At a 95% level of confidence, how large a sample is required? (Round the final answer to the nearest whole number.) The sample size is 00:49:12 ences oints Proctoring Enabled: CH 8B Quiz 6 The estimate of the population proportion is to be within plus or minus 0.09, with a 80% level of confidence. The best estimate of the population proportion is 0.21. How large a sample is required? (Round the final answer to the nearest whole number. Round the intermediate calculation to 2 decimal places.) Sample size ca 00:49:06 ferences