The partial results below are based on a sample of recently trained workers, to determine if the number of hours of training time received (X, in hours) has helped in improving the time taken to troubleshoot a process problem (Y, in minutes). Aner What is the upper limit of the 20% confidence Intoned estimate for the profago time tikon to troubleshoot a precuss problem. of all worklor with 415 8 minutes of training time? Answer: GLL Insurance company often backs life expectancy Information to determine life insurance policy for it policyholders. Two years ago, the wernge He pireclancy reGLL insurance company often tracks life expectancy Information to determine life Insurance policies for its policyholders. Two years ago, the average life expectancy of all policyholders was 79 6 years with a standard deviation of 3 30 years. At this time, GLL wants to estimate the average le expectancy to within one year with 99%% confidence, How many randomly selected recently pald policies would be needed to sample? Answer A poll want conducted to determine the popularity of a 30 pome croton software that was targeted to be launched in three months, Online Interviews with 1200 young adults were conducted which revealed Duit 45% said they would purchase Tonew software. The margin of error was $3 percentage points. What is the moded sample tire to oblah a pot confidence Interval estimate of the percentage of the tangoled young adults who will purchase the new software by uliving Answer:ABC Inc., with the province-wide operation for 15 years, h estimated to have about 12 5% the market share. Over the period of the last 12 months, its business activities were trending at high levels. Encouraged with the trend, it launched a marketing campaign to promote its products and services At the and of the campaign period, the company conductya survey to assess whether is market share has increased Based on 650 survey participants the rowell obtained was 15,8% What is the associated p-value of the test stwosoo for testing the company's claim? Answer. Consider a beat involving the null hypothesis that the mein age of the local gyms members is less than or equal to 30 whit vorun in ate moove that the meaning igniter can 30 your's, A random sample is tocon and the subsequent Simple was used to beplate ba bil that he mean age Is equal to 30 years, wants an appropriate atemating, whatThe regression Ine y, =4+ 1.6x, has been filled to the data points (x, y (3. 8), (2, 7). (1, 6) (4, 11). Find the standard error of estimate. Answer For an upper-tail best at the 1%% significance level, what is the Appropriate critical value when a sample of sice 20 1 drawn from a normal population with unknown standard deviation? An wiseably line wil be shut down for maintenance if he defect inthe grenade 1 814 Suppose you adopta 2 8% significance Level and take a from sample of 200 Gems fromAn assembly line will be shut down for maintenance if the defect rate exceeds 1.5%. Suppose you adopt a 2.5%% significance level and take a random sample of 300 items from the assembly line and compute the proportion of defective items. For what values of the sample proportion will the assembly Ino bo shut down? . Answer. A linear mecrossion model based on a random sample of 38 observations on the response variable and 4 predictors has in multiple conffic ant of determination equal to 0.697. What ba the value of the adjusted multiple coefficient of determination
