The Mean Number of Travel Days Per Year for Salespeople

question 125

Multiple Choice

The mean number of travel days per year for salespeople employed by hardware distributors needs to be estimated with a 0.90 degree of confidence. For a small pilot study the mean was 150 days and the standard deviation was 14 days. If the population mean is estimated within two days, how many salespeople should be sampled?

• A) 134
• B) 452
• C) 511
• D) 2100

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Definitions:

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A developmental disorder characterized by difficulties with social interaction and communication, and by restricted and repetitive behavior.