What is the 95% confidence interval for the difference in the population means, µ1 - µ2, given the data from the two independent samples: [-5.93 , -1.27] [-6.45 , -0.75] [-6.15, -1.05] [-6.36 , -0.84]

A sample of N = 9 individuals participates in a repeated measures study that produces a sample mean difference of X = 4.25 with SS = 128 for the difference scores. Is this mean difference large enough to be considered a real positive effect?

Determine the margin of error for the confidence interval for the mean: 23 +1.7 The margin of error is

If you look at the differences between the means, once with 10 participants and one mean with 20 participants. (same data set) One mean difference is very large, but non-significant and the other is very small, but came out significant. What could be the reason for this outcome? (My difference in means was with 10 participants: -1.1 and with 20 participants: -5.1)

a sample of n = 10 score has ss= 108 what is the variance for this sample

Imagine that a researcher wants to compare the intelligence levels of Poodles to all dogs.  He hypothesizes that Poodles will score differently than other dogs.  He uses a standard test of dog intelligence in his study. The population of all dogs has a mean of μ = 100, and an SD of 15.  He obtains a random sample of 500 Poodles and he finds that the mean intelligence score of the sample is 117.   Is this a one- or two- tailed test? Write the Ho and Ha for this research question. What kind of statistic should be calculated to test the hypothesis? Compute that statistic by hand What should the researcher conclude? Write a blurb describing the results

Determine the margin of error for the confidence interval for the mean: 16+1.5 The margin of error is