A Researcher Wishes to Determine the Difference in Two Population

question 68

Multiple Choice

A researcher wishes to determine the difference in two population means.To do this, she randomly samples 9 items from each population and computes a 90% confidence interval.The sample from the first population produces a mean of 780 with a standard deviation of 240.The sample from the second population produces a mean of 890 with a standard deviation of 280.Assume that the values are normally distributed in each population.The point estimate for the difference in the means of these two populations is _______.

• A)-110
• B)40
• C)-40
• D)0
• E)240

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