I am having trouble solving these study questions if I can please receive help.

The frequency distribution below summarizes employee years of service for Alpha Corporation. What is the class boundaries of scores interval 6-10? Years of service Frequency 1 -5 5 610 20 11-15 25 16-20 10 2125 5 26-30 3 0 6,10 0 59,101 0 599,1001 O 5.5, 10.5 p - P The formula Z = is for which of the following hypothesis test? p(1 - p) n O two-sample proportion O two-sample mean O one-sample proportion O one-sample meanIn a survey of public opinion concerning state aid to a particular city, every 50th person registered as a voter was interviewed, beginning with a person selected at random from the rst 50 listed. This is an example of 0 simple random sampling 0 stratied sampling 0 cluster sampling 0 systematic sampling A random sample of 50 students at a large high school resulted in a 95 percent condence interval for the mean number of hours of sleep per day of (6.73, 7.67). Which of the following statement best summarizes the meaning of this condence interval? 0 We are 95% condent that the interval from 6.73 to 7.67 actually contains the true population mean number of hours of sleep per day of all students at a large high school. 0 95% of the students in the survey reported sleeping between 6.73 and 7.67 hours per day. Q A student selected at random from this population sleeps between 6.73 and 7.67 hours per day for 95% of the time. Q 95% of the students in this high school sleep between 6.73 and 7.67 hours per day