Question 117 (1 point) A researcher wishes to determine the difference in two population means. To do this she randomly samples 9 items from each population and computes a 90% confidence interval. The sample from the first population produces a mean of 780 with a standard deviation of 240. The sample from the second population produces a mean of 890 with a standard deviation of 280. Assume that the values are normally distributed in each population. The t value used for this is 1.86 1.734 1.746 1.337 2.342