# Estimation, sampling distribution

1) Assuming the following numbers are dollar amounts per treatment with a specific drug, develop a point estimate of the mean cost per treatment of the drug. Next, develop a point estimate of the standard deviation of the cost per treatment of the drug.

4376 5578 2717 4920 4495
4798 6446 4119 4237 3814

2) The population mean SAT score is u = 1020 and a population standard deviation is o = 100. What is the probablity that a random sample of 75 students will provide a sample mean SAT score within 10 of the population mean? Secondly, what is the probability a random sample of 75 students will provide a sample mean SAT score within 20 of the population mean?

3) A simple random sample size of 100 is selected from a population with p = .40.
What is the expected value of p”with a line over it”.
What is the standard error of p”with a line over it”?
Show the sampling distribution of p”with a line over it”.
What does the sampling distribution of p”with a line over it” show?

4) A simple random sample of size 50 is selected from a population with o = 10. find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate).
the population size is infinite.
the population size is n = 50,000.
the population size is n = 5000
the population size is n = 500

5) The following data indicate the number of persons who are bullish, neutral, and bearish on the short-term prospects for the stock market:
Bullish 409 Neutral 299 Bearish 291
Develop a point estimate of the following population parameters:
The proportion who are bullish on the stock market
the proportion who are neutral on the stock market
the proportion who are bearish on the stock market.

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