# ex2_fa05 - STA 6126 Fall 2005 Exam 2 PRINT Name 1 A...

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STA 6126 Fall 2005 Exam 2 PRINT Name ____________ 1. A researcher reports a 95% confidence interval for the mean distance traveled daily to work for residents in a large city is 12 to 16 miles. The best statement to describe her result is: a) If she repeatedly took samples of this size, her sample mean would fall in this range 95% of the time b) 95% of the people in the city drive between 12 to 16 miles to work c) If we repeatedly took samples of this size and constructed a confidence interval in this form, in 95% of the samples the interval would contain the true population mean d) The population mean will be in this range 95% of the time 2. A test that the proportions of males and females favoring a change in a city ordinance are the same results in a P -value of 0.003. The 95% confidence interval for the difference ( π Μ F ) will: a) Contain 0 b) Be entirely positive if the sample proportion of males is higher c) Be entirely negative if the sample proportion of males is higher d) Be unknown as to whether it includes 0 3. All else being the same, the effect of increasing a sample by a factor of 4, has what

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ex2_fa05 - STA 6126 Fall 2005 Exam 2 PRINT Name 1 A...

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