A randomized controlled trial is run to evaluate the effectiveness of a new drug for asthma in children. A total of 250 children are randomized to either the new drug or placebo (125 per group).The mean age of children assigned to the new drug is 12.4 with a standard deviation of 3.6 years.The mean age of children assigned to the placebo is 13.0 with a standard deviation of 4.0 years.Is there a statistically significant difference in ages of children assigned to the treatments?Apply the two sample z test at a 5% level of significance.

1.Critical z value = +/-

2.Computed statistic=

3.Based on comparing the computed statistic to the critical value which of the following is (are) true? (6 points)

a. There is significant evidence, alpha=0.05, that there is a difference in ages of children assigned to the treatments.

b. There is not significant evidence, alpha=0.05, that there is a difference in ages of children assigned to the treatments.

c. Statistically speaking the difference in initial weights and weights after 6 weeks is 0.

d. b and c.

*I'm not sure if I'm using the correct test to compute this. I keep coming up with z = -.968 Is that correct?