Scientists are working on a synthetic vaccine (antigen) for a particular parasite. The success of the vaccine hinges on the characteristics of DNA in peptide (protein) produced by the antigen. In one study, scientists tested alleles of antigen-produced protein for level of peptide. For a sample of 20 alleles, the mean peptide score was 4.27 and the standard deviation was 0.32. Use this information to find a lower bound for the true mean peptide score in alleles of the antigen-produced protein when the confidence interval is 90%. Round your final answer to two decimal places as needed.
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