Write the null and alternative hypotheses for each of thefollowing examples. Determine if each is a case of a two-tailed, aleft-tailed, or a right-tailed test. (a) To test if the mean numberof hours spent working per week by college students who hold jobsis different from 20 hours (b) To test whether or not a bank’s ATMis out of service for an average of more than 10 hours per month(c) To test if the mean length of experience of airport securityguards is different from 3 years (d) To test if the mean creditcard debt of college seniors is less than $1000 (e) To test if themean time a customer has to wait on the phone to speak to arepresentative of a mailorder company about unsatisfactory serviceis more than 12 minutes
