A gym advertises that the mean monthly membership fee is less than $\$55$. In testing this claim, which scenario describes a Type II error in testing this claim?

• A. Concluding the mean fee is less than $\mathrm{\backslash (}55$ when it is actually $\mathrm{\backslash )}55$
• B. Concluding the mean fee is not less than $\mathrm{\backslash (}55$ when it is actually less than $\mathrm{\backslash )}55$
• C. Concluding the mean fee is $\mathrm{\backslash (}55$ when it is actually less than $\mathrm{\backslash )}55$
• D. Concluding the mean fee is less than $\mathrm{\backslash (}55$ when it is actually not less than $\mathrm{\backslash )}55$

Answer: (B)