In t-test, if the variances of two sampled populations of size 30 and 28 are assumed to be the same, what is the degrees of freedom of the test?1 point29275657

Assume there is a sample of n1=8,with the sample mean X1=39 and a sample standard deviation of S1=2,and there is an independent sample of n2=4 from another population with a sample mean of X2=35 and a sample standard deviation S2=5.In performing the pooled-variance t test,how many degrees of freedom are there?

The degrees of freedom for a two-sample t-test is

A sample of 20 is selected from the population. To determine the appropriate the critical t-value, what number of degrees of freedom should be used?Select one:A. 21B. InfinityC. 20D. 19

Miriam is using a one-sample t-test on the following group:Subject #15: 6.5 hoursSubject #27: 5 hoursSubject #48: 6 hoursSubject #80: 7.5 hoursSubject #91: 5.5 hoursWhich of the following statements is true?a.)Miriam needs to use a t-test when the standard deviation is known.b.)The value for the degrees of freedom for Miriam's sample population is five.c.)The value for the degrees of freedom for Miriam's sample population is four.d.)The t-distribution that Miriam uses is taller and has thinner tails than a normal distribution.

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 freedomClear my choice