QUESTION 13 Fitting a straight line to a set of data yields the following prediction line. Yi=6+7Xi. Predict the mean value of Y for X=2. O 20 O 13 06 14 QUESTION 14 For a one-tailed hypothesis test the critical value is 2.48 and tstat= 3.134. What is the statistical decision? O Since the tSTAT value is less than the critical value, reject HO O Since the tSTAT value is greater than the critical value, reject HO. O Since the tSTAT value is less than the critical value, do not reject HO O Since the tSTAT value is greater than the critical value, do not reject HO QUESTION 15 For sample sizes greater than 30, the sampling distribution of the mean will be approximately normally distributed O regardless of the shape of the population. O only if the shape of the population is symmetrical. O only if the standard deviation of the sample is known. O only if the population is normally distributed. QUESTION 16