A vice president for large corporation claims that average number of service calls upon equipment sold by that corporation is no more than 15 per week. To investigate her claim, service records were checked for randomly selected n=35 weeks. Yielding the sample average of 17 number of service calls as well as sample variance 9. We are interesting in finding out if sample evidence contradict the vice presidents clam at significance level alpha = .05?
Determine the parameter of interest?
Determine the null hypothesis?
Determine the alternative hypothesis?
Determine the rejections region?
Determine the value of the test statistic?