A recent newspaper article claims that the mean number of screens

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Asked by desconhecido23

A recent newspaper article claims that the mean number of screens per household is greater than 9.  A random sample of 39 households had a sample mean of 5.12 screens.  Assume that the population standard deviation is known to be 1.23 screens. For this question, you are required to give your answer in two parts a) and b):

a) Enter 3 if Z or 5 if t.  Please note, that the values in part a) have no further use in this question.  

b) Give the  value of the calculated test statistic.  Please give your final answer correctly rounded to two decimal places.  Work to a minimum of 4 decimal places throughout your calculation.

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