A random sample of 200 people was taken. sixty percent of, Ask an Expert

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A grocery store takes a random sample of 200 customers. The average check-out time is 4 minutes with a standard deviation of two minutes.

1) A random sample of 244 observations has a mean of 10, a median of 12 and a mode of 33. The population deviation is known to equal 2.8. the 95.44% confidence interval for the population mean is?

2) The following random sample was collected: 22 33 44 6 The 80% confidence interval for the mean is?

3) A random sample of 200 people was taken. Sixty percent of the people favor President Obama. The 95% confidence interval for the true population of people who favor Obama is?

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