Allen Distributing Company hypothesizes that a phone call is more effective than a letter in speeding up collection of slow accounts. Two groups of slow accounts were contacted, one by each method, and the length of time between mailing the letter or making the call and the receipt of payment was recorded: Method Used Days to Collection Letter 10 8 9 11 11 14 10 Phone call 7 4 54869 (a) At α = 0.025, should Allen conclude that slow accounts are collected more quickly with calls than with letters? (b) Can Allen conclude that slow accounts respond more quickly to calls?

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