We are interested in significant differences (level α = 0.05) between the expected values μ1 and μ2 of two populations. Which of the following statements on statistical tests are correct? a) We will formulate the null hypothesis as μ1 = μ2. b) A t-test can always be applied in this situation. c) A p-value is the probability that the null hypothesis is correct, given the observed data. d) If we obtain a p-value of 0.04, we will reject (level α = 0.05) the null hypothesis.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.