There are two groups under investigation.
42 people in group 1 on the diet and excercise programme.
39 people in group 2 on a diet only programme.
After 2 moths the sample mean weight loss for group 1 was 9.12kg.
The sample mean weight loss for group 2 was 8.36kg.
The estimated standard error was 0.42kg.
A two sample z-test is to be carried out to investigate if there is significan difference in weight loss between the groups.
which 2 options give the magnitude of the test statistic, z, at two decimal places, and the conclusion obtained from the test.
a) 1.81 b) 1.92 c) 3.40 d) 6.83 e) 18.34 f) 20.72
g) there seems to be a signficiant difference at the 5% significance level.
h) there seems to be no significant difference at the 5% significance level
42 people in group 1 on the diet and excercise programme.
39 people in group 2 on a diet only programme.
After 2 moths the sample mean weight loss for group 1 was 9.12kg.
The sample mean weight loss for group 2 was 8.36kg.
The estimated standard error was 0.42kg.
A two sample z-test is to be carried out to investigate if there is significan difference in weight loss between the groups.
which 2 options give the magnitude of the test statistic, z, at two decimal places, and the conclusion obtained from the test.
a) 1.81 b) 1.92 c) 3.40 d) 6.83 e) 18.34 f) 20.72
g) there seems to be a signficiant difference at the 5% significance level.
h) there seems to be no significant difference at the 5% significance level