Two independent random samples have been​ selected, 100 observations from population 1 and 100 from population 2. Sample means for population 1 is 77 and for population 2 is 47. From previous experience with these​ populations, it is known that the variances are 11 and 9 for population 1 and 2 respectively. If you want to compare the population means for these samples, what is the lower bound for the 95% confidence interval of the difference? Round your final answer to two decimal places as needed.(Don't Ha

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