0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.0 0.500000 0.503989 0.507978 0.511967 0.515953 0.519939 0.532922 0.527903 0.531881 0.535856 ........ ...... ............. .......... ..................

A random sample of 36 textbook prices is taken from a local college bookstore. The mean of the sample is x= 72 , the sample standard deviation is s = 24, and the population is normally distributed.

You want to estimate the mean price of all the textbooks in the college bookstore. How many books must be included in your sample if you want to be 95% confident that the sample mean is within $4 of the population mean?

Extracted text: 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.0 0.500000 0.503989 0.507978 0.511967 0.515953 0.519939 0.532922 0.527903 0.531881 0.535856 ........ ...... ............. .......... ............... .............. ........ ......... 1.5 0.933193 0.934478 0.935744 0.936992 0.938220 0.939429 0.940620 0.941792 0.942947 0.944083 1.6 0.945201 0.946301 0.947384 0.948449 0.949497 0.950529 0.951543 0.952540 0.953521 0.954486 1.7 0.955435 0.956367 0,957284 0.958185 0.959071 0.959941 0.960796 0.961636 0.962462 0.963273 1.8 0.964070 0.964852 0.965621 0.966375 0.967116 0.967843 0.968557 0.969258 0.969946 0.970621 1.9 0.971283 0.971933 0.972571 0.973197 0.973810 0.974412 0.975002 0.975581 0.976148 0.976705 2.0 0.977250 0.977784 0.978308 0.978822 0.979325 0.979818 0.980301 0.980774 0.981237 0.981691