The National Health Statistics Reports published in 2008 rep…
The National Health Statistics Reports published in 2008 reported the following weights for randomly selected samples of one year old girls and one year old boys. The means and standard deviations are in pounds. Group Girls Boys Mean 24.1 24.5 Standard Deviation 4.3 4.1 Sample Size 328 300 Construct and interpret a 96% confidence interval for the difference between the mean weights. Hints: Since you’re dealing with 2 independent samples, to construct the confidence interval STATS->TESTS-> 2SampleTinterval . (+,+) Positive difference ; (-,-) Negative difference ; (-,+) there’s not a significant difference between the variables