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Sample mean annual contribution per employee

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Using normal distribution, you take a random sample of 25 employees and find that the sample mean annual contribution per employee is $501 with a standard deviation of $17. What are the boundaries for a 99% confidence interval for the population mean?

An advisor to the mayor of a large city wants to estimate within 2450 minutes the mean travel time to work for all employees who work within the limits of the city. He knows that the standard deviation of all travel times is 11.35 minutes, he also wants to achieve a 95% confidence interval. He will poll a random sample of employees, how many should he poll?

You ask 2500 actors if they have appeared in a production and 1225 say yes while the rest say no. The value p is the proportion of actors who have appeared in one. You next draw a random sample of 11 actors. What are the mean and standard deviation of the sample proportion?

Reference no: EM132401446

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