Mathematics, 14.07.2019 08:00, sarmientojose267
Apaint manufacturer wishes to compare the drying times of two different types of paint. independent random samples of 11 cans of type a and 9 cans of type b were selected and applied to similar surfaces. the drying times (in hours) were recorded. the summary statistics are as follows. type a type b mean 76.8 hours 66.1 hours standard deviation 4.5 hours 5.1 hours sample size 11 9 construct a 95% confidence interval for the difference between the mean drying time for all type a paint and type b paint. the degree of freedom that is used for the construction of this 95% confidence interval is
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