A standardized math test was administered to two groups of 5th graders, one group sampled from classes whose teachers had followed the existing curriculum and one group sampled from classes whose teachers had followed a new curriculum, and the scores were compared using a t-test with the following results: Old Curriculum New Curriculum Mean 65.06382979 66.5106383 Variance 822.4523589 127.5161887 Obervations 47 47 Hypothesized Mean Difference 0 df 60 t Stat -0.321814324 P(T<=t) 0.37 t Critical one-tail 1.670648865 P(T<=t) two-tail 0.75 t Critical two-tail 2.000297822 You decide to use the conventional p=.05 as your cutoff for statistical significance. What do you conclude from this analysis? a. The wrong t-test was conducted because of the relative sizes of the two groups' variances. b. We should reject the null hypothesis, which is that the two groups' means are equal in the populaton of 5th graders. c. We should not reject the null hypothesis, which is that the two groups' means are equal in the population of 5th graders. d. We should reject the null hypothesis, which is that the two groups'means are not equal in the population of 5th graders.
A standardized math test was administered to two groups of 5th graders, one group sampled from classes whose teachers had followed the existing curriculum and one group sampled from classes whose teachers had followed a new curriculum, and the scores were compared using a t-test with the following results: Old Curriculum New Curriculum
Mean 65.06382979 66.5106383
Variance 822.4523589 127.5161887
Obervations 47 47
Hypothesized Mean Difference 0
df 60
t Stat -0.321814324
P(T<=t) 0.37
t Critical one-tail 1.670648865
P(T<=t) two-tail 0.75
t Critical two-tail 2.000297822
You decide to use the conventional p=.05 as your cutoff for statistical significance. What do you conclude from this analysis?
a. The wrong t-test was conducted because of the relative sizes of the two groups' variances.
b. We should reject the null hypothesis, which is that the two groups' means are equal in the populaton of 5th graders.
c. We should not reject the null hypothesis, which is that the two groups' means are equal in the population of 5th graders.
d. We should reject the null hypothesis, which is that the two groups'means are not equal in the population of 5th graders.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
