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SOLVED: Suppose a researcher is interested in a new treatment plan for CD4 cell count in immune-compromised patients with HIV. In order to investigate the new drug, the researcher gathers a group of 25 individuals with a mean CD4 count of 335 cells/mm³ after treatment, with a standard deviation of 12.1. Test the hypothesis that the mean CD4 count goal is not 329.28 cells/mm³. Perform a two-way directional test; complete the 5-step process and calculate the appropriate confidence interval: (Use

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