In problems 11 -14, do one of the following as appropriate: (a) find the critical value, (b) find the critical value, (c) state that neither the normal nor the t distribution applies.

98%; n = 7, = 27; population appears to be normally distributed

91%; n = 45; is known, the population appears to be very skewed.

95%; n = 11; is known; population appears to be very skewed.

Questions are from the book elementary statistics 13th edition