If we are testing the hypothesis about the mean of a population of paired differences with samples

Question 1 If we are testing the hypothesis about the mean of a population of paired differences with samples of n1=10, n2=10, the degrees of freedom for the t statistic is 18.  True  False 2 points    Question 2 In general, the shape of the F distribution is skewed right.  True  False 2 points    Question 3 When comparing two independent population means, if n1 = 13 and n2 = 10, the degrees of freedom for the t statistic is 22.  True  False 2 points    Question 4 In testing for the equality of variances from two independent populations, if the null hypothesis is false, the test could result in: A Type I error Either a Type I error or a Type II error Neither a Type I error nor a Type II error A Type II error Both a Type I error and a Type II error 2 points    Question 5 In testing the difference between the means of two normally distributed populations using large, independent random samples, the correct test statistic to use is: Z statistic t statistic F statistic Chi-square statistic