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Shape of the sampling distribution

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In a large population of US cell phone owners, the mean number of contacts is 112 with a standard deviation of 20. Suppose 200 cell phone owners are randomly selected for a market research campaign. What is the shape of the sampling distribution of the sample mean number of contacts?

  • Approximately Normal, because the sample size is greater than 30.
  • We cannot say, because 200 cell phone owners is less than 10% of the population.
  • We cannot say, because the sample size is greater than 30.
  • Approximately Normal, because it is reasonable to assume that this population is Normally distributed.
  • Approximately Normal, because 200 cell phone owners is less than 10% of the population.

Reference no: EM131051699

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