hospital director wishes to estimate the mean weight of babies born in the hospital. How large a sample of birth records should be taken if she/he wants a 99% CI of 2 wide? Assume that a reasonable estimate of population standard deviation is 5.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b