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A study is run to estimate the average number of toilet paper rolls a typical U.S....

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Statistics

A study is run to estimate the average number of toilet paperrolls a typical U.S. household currently have. Say a sample of 10households is selected last month and they reported the number oftoilet paper (in rolls) as follows.

                       75         56        50        94        65       111      97        88            103       98

  1. Assume the average amount of toilet paper a household usuallyhave is 55 rolls at national level. Test whether the mean number oftoilet paper rolls in this sample is significantly different fromthe national level? Use alpha level of .05.
  2. Based on your results from part (a), without calculating theconfidence interval, describe how the confidence interval of theaverage number of toilet paper at national level.  (Hint:interpret the meaning of confidence interval in relation to ahypothesis test.)

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