Two Samples each of size 20 are taken from independent populations assumed to be normally distributed with equal variances. The first sample hasa mean of 435 and standard deviation of 4.1 while the second sample has a mean of 40.1 and standard deviation of 32 A researcher would like to testir there is a difference between the population means at the 0.05 significance level. What can the researcher conclude? Select one a. There is sufficient evidence to reject the nult hypothesis and conclude that the two population means are different O b. The answer cannot be determined without calculating the p-value and comparing it to the significance level There is not sufficient evidence to reject the null hypothesis, the population means and standard deviations are equal O d. The two population means are equal but the standard deviations are different