The Professor's Response

For homework problem 13 in section 7.2 if I cant find it on the t-table, I tried looking on the z-table but its giving me the wrong answer. Can you please go over how to do it.

13: The confidence level is 92%. The sample size is 49. The sample mean is 512, and the population
standard deviation is 28.

  See the professor's answer below.

Professor McGukian

Hi Natalie,

The critical value for this confidence level was done in section 7.1, see the video below.

After finding that value the calculation becomes: E = 1.75*28/root(49) = 1.75 * 28/7 = 1.75*4 = 7


Professor McGuckian

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