1. Using the dataset FloridaLakes, is there evidence of a negative correlation between pH in lakes and mercury levels in fish? Assume the conditions for inference are met, and that the p-value is less than 0.005. There is no need to find the test-statistic since we already have a p-value, but comment on all other steps for this test.

Section 6.1 Use Table A for critical values and p-values. 2. The table below shows a two-way table for Servers A, B, and C and for whether a credit/debit card or cash was used for payment (yes for a credit or debit card, no for cash).

a. Use the information to compute and interpret a 95% confidence interval for the proportion of bills paid with a credit card. An estimate of the standard error is SE = 0.037.