A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. For a one-tailed test of hypothesis at the .01 significance level to determine if there is a difference in the population means, the degree of freedom isQuestion 4Select one:a.17b.18c.None of the aboved.16

A random sample of 10 observations is selected from a normal population with an unknown standard deviation. To conduct a test of hypothesis about the population mean the appropriate degrees of freedom isQuestion 3Select one:a.10b.None of the abovec.11d.9Clear my choice

We wish to conduct a test of hypothesis on two independent population means. The alternative hypothesis of the test states that the means differ. Both populations are assumed normal with equal variance. We draw 10 observations for the first sample and 20 observations for the second sample. State the decision rule for the test if the level of significance is 0.01.Question 2Select one:a.we reject Ho if t > 2.4671b.we reject Ho if t <-2.4671 or t > 2.4671c.we reject Ho if t > 2.3263d.we reject Ho if t <-2.7633 or t > 2.7633

We wish to conduct a hypotheses test of the formH0: μ1 - μ2 = 0 vs H0: μ1 - μ2 > 0Both populations are assumed normal with equal variance. We draw 15 observations for the first sample and 12 observations for the second sample. State the distribution of the test statistic for the test.Question 1Select one:a.t-distribution with 26 degrees of freedomb.t-distribution with 27 degress of freedomc.t-distribution with 25 degrees of freedomd.normal distribution with 25 degrees of freedom

A sample of 39 observations is selected from a normal population. The sample mean is 43, and the population standard deviation is 6. Conduct the following test of hypothesis using the 0.02 significance level.

What is the primary difference between a one-tailed and a two-tailed test?  A. The level of significance  B. The number of hypotheses tested  C. The directionality of the hypothesis  D. The sample size