question 7 may have more than one answer

Q1 0.5 Points To investigate if younger restaurant customers are more likely than older restaurant customers to give at least a 20% tip. Which of the following is an appropriate alternative hypothesis? O Py - Po # 0 O Py - Po 0 O Py - Po = 0 Save Answer Q2 0.5 Points To investigate if younger restaurant customers are more likely than older restaurant customers to give at least a 20% tip. Which of the following is an appropriate null hypothesis? O Py - Po # 0 O Py - Po 0 O Py - Po = 0 Save Answer Q3 0.5 Points In a survey conducted in April, data from random samples of 50 first-year and 55 fourth-year UVa students was collected. Students were asked if they attended at least 5 UVa basketball games the season that just ended. 17 first-years and 26 fourth-years said yes. What is the pooled estimate of the proportion of UVa students who have been to at least 5 basketball games during the season? O 17/50 O 26/55 O 43/105 O 17/50 + 26/55 Save AnswerQ6 0.5 Points What inferential procedure should be used to analyze the average amount of money that UVa students spend on textbooks for this semester? O one-sample z for means O one-sample t for means O matched pairs t for means O two-sample t for means O one-sample z for proportions O two-sample z for proportions Save Answer Q7 0.5 Points Which of the following must be true for the confidence interval for the difference in proportions to be reliable ? O nip1 2 10 On2p2 > 10 On(1 - p1) 2 10 On2(1 -p2) 2 10 O nip1 2 10 On2p2 2 10 On1(1 -p1) 2 10 On2(1 -p2) 2 10 Save Answer Q8 0.5 Points What type of test should you use if you have a single binary response variable? O one-sample t test for means O one-sample z test for means O one-sample z test for proportions O one-sample t test for proportionsQ9 0.5 Points What type of test should you use if you have a single quantitative response variable and do not know the population standard deviation? O one-sample t test for means O one-sample z test for means O one-sample z test for proportions O one-sample t test for proportions Save Answer Q10 0.5 Points If you increase the allowable margin of error but keep everything else the same, what happens to the required sample size for each sample? O It increases It decreases O Not enough information. Save