105. Is sea level the same along all coastal regions? To examine this a sample of 12 coastal locations in the Gulf Coast had mean sea level 5.3953 m and standard deviation 2.2559 m . A sample of 17 locations along the eastern seaboard had mean 3.4028 m and standard deviation 1.036 m . We can assume the distribution of sea level is Normal. (a) What is the point estimate for the difference in mean sea level between the Gulf Coast and eastern seaboard? (b) What is the standard error of the difference in means? (c) What is the margin of error for a \( 90 \% \) confidence interval? (d) Construct and interpret the confidence interval for the difference in mean sea level between the Gulf Coast and the eastern seaboard. (e) Based on the interval, do you expect there to be evidence or little to no evidence for \( H_{a} \) : \( \mu_{1} \neq \mu_{2} \) ? Explain without conducting the hypothesis test.
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