In a sample of 49 adolescents who served as the subjects in an immunologic study, one variable of interest was the diameter of skin test reaction to an antigen. The sample mean was 21. From previous...

In a sample of 49 adolescents who served as the subjects in an immunologic study, one variable of interest was the diameter of skin test reaction to an antigen. The sample mean was 21. From previous studies we know that the variance of the population was 121. Can it be concluded from these data the the population mean is less than 23? Let a(alpha)= 0.05

*with steps and explains and equations please��?