A researcher wants to estimate the difference in the means oftwo populations. A random sample of 36 items from the firstpopulation results in a sample mean of 430. A random sample of 49items from the second population results in a sample mean of 460.The population standard deviations are 120 for the first populationand 140 for the second population. From this information, a 95%confidence interval for the difference in population means is_______.
Select one:
a. -102.83 to 42.43
b. -27.6049 to 87.6049
c. -76.53 to 16.53
d. -95.90 to 35.90
