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12 A young woman works two jobs and receives tips for both jobs As a...

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12 A young woman works two jobs and receives tips for both jobs As a hair dresser her distribution of weekly tips has mean 65 and standard deviation 5 75 As a waitress her distribution of weekly tips has mean 154 and standard deviation 8 02 What are the mean and standard deviation of her combined weekly tips Assume independence for the two jobs Pearson s test prep pg 170 10 A mean 167 16 standard deviation 9 87 B mean 167 16 standard deviation 13 77 C mean 219 00 standard deviation 2 27 D mean 219 00 standard deviation 9 87 E mean 219 00 standard deviation 13 77 13 A cause and effect relationship between two variables can best be determined from which of the following prep pg 170 11 Pearson s test A A survey conducted using a simple random sample of individuals B a survey conducted using a stratified random sample of individuals C When the two variables have a correlation coefficient near 1 or 1 D An observational study where the observational units are chosen randomly E A controlled experiment where the observational units are assigned randomly to treatments

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