Calculus and Above

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Interested in social experiments, you...

Interested in social experiments, you want to estimate the percentage of US adults willing to sing karaoke in front of strangers. You want to be within 3 percentage points of the true proportion measure, based upon a 95% confidence level. What size sample is required?--(NOTE that no estimate of "p-hat" is given.)

A researcher wants to determine the mean amount of time per day spent watching TV. A random sample of 175 people gave a mean of 4.3 hours of TV watched per day. Based upon a desired 99% confidence level, determine the associated confidence interval describing the average amount of time per day spent watching TV for the entire population. (Assume a population standard deviation of 1.57 hrs)

You need to estimate the mean Christmas sales across a large chain of jewelry stores. You want to estimate this mean value to within $100 with 95% confidence. Previous studies indicate that the standard deviation for sales across the stores has been $300. How many randomly selected stores from the chain should your sample contain to meet this desired level of accuracy?

A researcher wants to determine the mean amount of time per day spent watching TV. A random sample of 175 people gave a mean of 4.3 hours of TV watched per day. Based upon a desired 99% confidence level, determine the associated confidence interval describing the average amount of time per day spent watching TV for the entire population. (Assume a population standard deviation of 1.57 hrs)

You need to estimate the mean Christmas sales across a large chain of jewelry stores. You want to estimate this mean value to within $100 with 95% confidence. Previous studies indicate that the standard deviation for sales across the stores has been $300. How many randomly selected stores from the chain should your sample contain to meet this desired level of accuracy?

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