Look at the following output, which compares the amount of movement measured in patients with Multiple Sclerosis after treatment (0 = no movement, 5 = much movement) with those patients waiting for treatment (control group)

11. Which is the most appropriate conclusion? We are 95% confident that the population mean difference:

a) Is 2.33

b) Lies somewhere between 1.33 and 3.33

c) Lies somewhere between 1.32 and 3.35

d) Is 4.84

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Group Statistics Group N Mean Std. deviation Std. error mean movement treatment group 12 4.00 .853 246 control group 12 1.67 1.435 .414 Levene's Test for quality of variances Independent Samples Test t-test for equality of means 95% Confidence interval of the difference Sig. Mean Std. error Sig. t df (2-tailed difference difference Lower Upper movement Equal 3.667 069 4.841 22 .000 2.333 .482 1.334 3.333 variances assumed Equal 4.841 17.905 .000 2.333 482 1.320 3.346 variances not assumed