1. Choose the BEST answer. A two sample z or t test is used to test: Group of answer choices whether two samples are from the same population or whether the means of two samples are significantly different whether the mean of differences is significantly higher than both sample means whether the population variance is normally distributed whether the mean of a sample is significantly greater or less than the population mean whether the mean of a sample is different from its population 2. You run your two-sample t-test. The results are significant at both the 5% and 1% level. What does this tell you? Group of answer choices You have a statistically significant result. The probability of NOT rejecting your null hypothesis [and rejecting your alternate hypothesis] is higher at the 1% level than the 5% level so you have more confidence in the results of the test at 1% The probability of rejecting your null hypothesis is higher at the 1% level than the 5% level so you can have more confidence in the results of the test at 5%. You need to increase your sample size and your population N The sample variances and the sample size is large