I would like some assistance with the following statistics questions

The failure rate for a particular course prior to the COVID-19 pandemic was on average 63%. During the 2021 sample of 19 students' tests scores were selected and a failure rate of 62% was obtained. A 90% condence interval for the proportion of students who failed the course is [60,67]. We would like to know if the failure rate of the course has changed since the onset of the pandemic. Given this information, we would, Select one: Q a. Fall to reject the null hypothesis O b. Accept the null hypothesis O c. Reject the null hypothesis Q d. No conclusion is possible You are interested in opening a local bank account However, you are concerned about the fees that banks charge for transactions. You would like to determine if the average transaction fee is more than $100 given information from all 25 local banks. To do this, you should Select one a construct a confidence interval O b. conduct a hypothesis test c. either construct a confidence interval of conduct a hypothesis test O d not use any inferential methods CheckAt the 10% level of significance, you want to test if the average length of time it takes to be served at a bank is no longer equal to 20 minutes, The following this a 90% confidence interval: (15, 21), Your conclusion is to 100 Select one. O a. reject the null hypothesis O b fail to reject the null hypothesis c. not make a decision. Od, accept the null hypothesis O e reject the alternative hypothesis Of accept the alternative hypothesis CheckIn the General Social Survey, respondents were asked "If your party nominated a woman for President, would you vote for her if she were qualified for the job?' It research are interested in determining if more than fifty percent will vote for her. what is the alternative hypothesis in words? Select one a. Fifty percent of the population will vote b. More than fifty percent of the population will vote c. More than fifty percent of the sample will vote d Fifty percent of the sample will not vote CheckResearchers wanted to determine the health of students at the tertiary level. They randomly select 71 students and ask them to complete a questionnaire about different aspects of their life, The confidence intervals for some of the variables are presented in the table below. If researchers want to determine at the 10% lever if, on average, the of 1 00 amount of time students spend exercising on a weekly basis is different from 180 minutes - Exercise (minutes) - they would 95% Confidence Interval Variable Lower Bound Upper Bound Phone Time (minutes) 14.359 20.679 Breakfast Calories (kcal) 240.753 349.585 Exercise (minutes) 134.739 208.106 Sleep (hours) 6.491 7.228 Social Media (minutes) 75.428 122.093 Select one a fail to reject the null hypothesis b accept the null hypothesis c reject the null hypothesis d not be able to conduct the test using this information CheckA random sample of 600 adults is taken from a population of over one million, in order to compute a confidence interval for a proportion. If the researchers wanted to decrease the width of the confidence interval, they could Select one O a. Increase the size of the population O b. Decrease the size of the sample c. Increase the size of the sample d. Decrease the size of the population Check