Question 1 1 pts As the degrees of freedom increase, O the t distribution becomes more and more like the normal distribution with mean 1 and standard deviation 0 O the t distribution becomes more and more like the standard normal distribution O the t distribution becomes more and more skewed to the right 0 the t distribution becomes less and less like the standard normal distribution Question 2 1 pts When constructing a z-lnterval, the z-value is always 1.?6 for 95% level of condence. When constructing a tinterval, for a xed sample size, as the condence level increases, the t value 0 It depends on whether the data come irom a prospective or retrospective study. 0 increases 0 remains constant 0 decreases Question 3 1 pts In calculating the Hnterval for the population mean, we need to subtract from and add to the sample mean what is called the margin of error. The margin of error is the product of the t7 value and the standard error of xbar. Find the tvalue when the sample size is 20 and the condence level is 90%. o 1.323 o 1.635 O 1.725 O 1.?29 Question 4 1 pts How are the t distribution and the standard normal (z) distribution similar? I. They are both bell-shaped. Il. They are both centered at 0. Ill. Their standard deviations are both 1. O I and II only O I, II and III O I and Ill O II and Ill only Question 5 1 pts If the null hypothesis is not rejected, then we say O we have sufficient evidence to believe that the sample size is too small O we have sufficient evidence to believe the alternative hypothesis is false O we do not have sufficient evidence to believe the alternative hypothesis is true O the null hypothesis is trueQuestion 8 What is the pvalue of a hypothesis test? 0 the probability that the alternative hypothesis is false 0 the probability, computed assuming that the null hypothesis is true. that the test statistic would take a value as extreme or more extreme than that actually observed 0 the probability that the null hypothesis is wrong 0 the probability, computed assuming that the null hypothesis is true. that the alternative hypothesis is in fact false Question 9 Which of the following supports the rejection of the null hypothesis? 0 a pvalue equal to the power of the test 0 a pvalue less than the signicance level 0 a p-value less than the probability of a Type II error 0 a large p-value Question 10 Why do we need to calculate the value of the test statistic? O to determine the randomness of the sample 0 to determine the p-value O to verifyI normality.r of the outcome 0 to assess the validity ofusing the t test statistic instead of the 2 test statistic