Let x bar be the sample mean of a random sample of size n drawn from some popula

Question

Let x bar be the sample mean of a random sample of size n drawn from some population x with mean 5 mu where mu is a parameter. Then x bar an unbiased estimator of um. (a) True (b) False When we use the F-distribution in comparing two population variances. both sampled populations must be approximately normal and the random samples must be selected independently of each other. (a) True (b) False One of the conditions required for a valid small sample t-test for population mean is that the population distribution is approximately normal. (a) True (b) False In a hypothesis test, if H_0 cannot be rejected at the alpha level of significance, we then know that H_0 must be true. (a) True (b) False ANOVA is a statistical technique we use to test the hypothesis that a population (treatment) mean equals some specified value. (a) True (b) False

Explanation / Answer

1. Ans----- False since xbar is unbiased estimator of 5mu.

2.Ans---- False

Since sample need not be independent

3. Ans----- true

4. Ans-----True

5. Ans----- False

Since ANOVA is used to equality o f means for different groups

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