Test the given claim. assume that a simple random sample is selected from a normally distributed population. use the critical value method of testing hypothesis. a. the stewart aviation products company uses a new production method to manufacture aircraft altimeters. a simple random sample of 81 altimeters is tested in a pressure chamber, and the errors in altitude are recorded as positive values (for readings that are too high) or negative values (for readings that are too low). the sample has a standard deviation of s = 52.3 ft. at the 0.05 significance level, test the claim that the new production line has errors with standard deviation different from 43.7 ft, which was the standard deviation for the old production method. if it appears that the standard deviation has changed, does the new production method appear to be better or worse than the old method?

Ascientist studied a population of workers to determine whether verbal praise and/or tangible rewards affect employee productivity. in the study, some workers were offered verbal praise, some were offered tangible rewards (gift cards, presents, and some were offered neither. the productivity of each participant was measured throughout the study by recording the number of daily tasks completed by each employee. which inference might the scientists make based on the given information? a.) the number of daily tasks completed by each employee may influence the dependent variable, which is whether the employee receives verbal praise, tangible rewards, or neither. b.) verbal praise and/or tangible rewards may influence the independent variable, which is the number of daily tasks completed by each employee. c.) verbal praise and/or tangible rewards may influence the dependent variable, which is the number of daily tasks completed by each employee. d.) the dependent variables, which are verbal praise and tangible rewards, may influence the number of daily tasks completed by each employee.