Statistics: Difference of means
The highway department is testing two types of reflecting paint for concrete bridge end pillars. The two kinds of paint are alike in every respect except that one is orange and the other is yellow. The orange paint is applied to10 bridges, and the yellow paint is applied to10 bridges. After a period of 1 year, reflectometer readings were made on all these bridge end pillars. (A higher reading means better visibility.) For the orange paint, the mean reflectometer reading wasx1 =9.4, with standard deviations1 =2.4. For the yellow paint the mean wasx2 =6.9, with standard deviations2 =2.5. Based on these data, can we conclude that the yellow paint has less visibility after 1 year? Use a10% level of significance.
What is the value of the sample test statistic? (Test the difference?1 ??2. Round your answer to three decimal places.) Please show steps
Find (or estimate) theP-value. (Round your answer to four decimal places.) Please show steps
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