 # What is the point estimate of the proportion of people in the population who are over 6 feet tall? Anonymous
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You need to explain your work STEP by step and include all the calculations, not just the results. 1. 50 people are selected randomly from a certain population and it is found that 12 people in the sample are over 6 feet tall. What is the point estimate of the proportion of people in the population who are over 6 feet tall? Select one: a. 0.50 b. 0.76 c. 0.18 d. 0.24 2. Find the appropriate critical value for the following: 99% confidence level; n = 17; σ is unknown; population appears to be normally distributed. Select one: a. t α/2 = 2.898 b. t α/2 = 2.921 c. z α/2 = 2.583 d. z α/2 = 2.567 3. Find the critical value χ 2R corresponding to a sample size of 19 and a confidence level of 99 percent. Select one: a. 6.265 b. 37.156 c. 7.015 d. 34.805 4. To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19 randomly selected dowels and finds the standard deviation of the sample to be s = 0.16. Find the 95% confidence interval for the population standard deviation σ. Select one: a. 0.13 < σ < 0.22 b. 0.12 < σ < 0.24 c. 0.15 < σ < 0.21 d. 0.11 < σ < 0.25 5. You want to estimate  for the population of waiting times at a fast-food restaurant’s drive-up windows, and you want to be 95% confident that the sample standard deviation is within 20% of . Find the minimum sample size needed. Is this sample size practical? 6. In the 1960s, data were collected on the weights of people to determine the safe passenger capacity of aircraft. Using a random sample, the mean weight was found to be 166.3 lbs. In recent decades, the mean weight of the population has increased considerably, so we need to update our estimate of that mean. Recently, a simple random sample of the weights of n = 40 people was collected and found to have a mean of = 172.55 lb. We do not know the standard deviation, but this is the dispersion of the weights in general so it should be between 30-50 pounds for adults. Let's assume that is 35 Let's assume the average here around 75. Let's assume a margin of error of 3%, how big should our sample be? ...
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1. 50 people are selected randomly from a certain population and it is f...

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Thanks, good work Brown University

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