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DALIL WHO 99% confidence about the possible size of our error 6- if we estimate the proportion of males with this blood disorder to be 0 24? A study is to be made to estimate the proportion of residents of a certain city and its suburbs who favor the construction of a nuclear power plant near the city How large a sample is needed if one wishes to be at least 95% confident that the estimate is within 0.04 of the true proportion of residents who favor the construction of the nuclear power plant? 230 calories per bar, with a standard deviation of 15 calories. - Construct a 99% confidence interval for the true mean calorie content of this brand of energy bar. Assume that the distribution of the calorie content is approximately normal b- What can we assert with 99% confidence about the possible size of our error if we estimate the average energy calories to be 220 calories per bar 2- A random sample of 12 shearing pins is taken in a study of the Rockwell hardness of the pin head. Measurements on the Rockwell hardness are made for each of the 12, yielding an average value of 48.50 with a sample standard deviation of 1.5. Assuming the measurements to be normally distributed i- construct a 90% confidence interval for the mean Rockwell hardness. 11- The upper 95% bound 3. An efficiency expert wishes to determine the average time that it takes to drill three holes in a certain metal clamp. How large a sample will she need to be 95% confident that her sample mean will be within 15 seconds of the true mean? - if we estimate the proportion of males with this blood disorder to be 0.24? A study is to be made to estimate the proportion of residents of a certain city and its suburbs who favor the construction of a nuclear power plant near the city. How large a sample is needed if one wishes to be at least 95% confident that the estimate is within 0.04 of the true proportion of residents who favor the construction of the nuclear power plant