Question

1.

True or False?

2.

True or False?

To compute a t statistic, you must use the sample variance (or standard deviation) to compute the estimated standard error for the sample mean. True False The 95% confidence interval for the difference between two treatment means extends from-2.50 to +5.50. Based on this information, you can conclude that there is no significant difference between the treatments at the .05 level of significance True O False

Answer 1

1. We use t statistics, when population variance (or population standard deviation) is not known, hence we will use sample variance (or standard deviation) to compute a t statistics

So answer is True

2. If a 95% confidence interval includes the null value, then there is no statistically meaningful or statistically significant difference between the groups.

As the case is same here we have 0 included in the interval ie -2.50 to +5.50

So there is no significant difference between the treatments

Answer is True.