Eleven students are in a chess club. Mr. Kossow determined that the median age of the students in this chess club was 12 years old which of the following statements must be true? Select all that apply A. All of the students in the chess club are 12.
B. At least half of the students in the chess club were 12 or older.
C. At least half of the students in the chess club were 12 or younger. D. The average age of the students in the chess club was 12.
E. The oldest student in the chess club was 12.
F. When all the ages of the students in the chess club were listed in order, the middle value was 12.

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10