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Question: A recent Gallup Poll found that of 800 randomly selected drivers surveyed, 70% thought they were better-than-average drivers. In truth, in the population, only 50% of all drivers can be "better than average."
a. Draw a picture of the possible sample proportions that would result from samples of 800 people from a population with a true proportion of .50.
b. Would we be unlikely to see a sample proportion of .70, based on a sample of 800 people, from a population with a proportion of .50? Explain, using your picture from part a.
c. Explain the results of this survey.
Probability is 0.5% that home will suffer the 50% loss due to fire. If we ignore all other partial losses, what premium must insurance company charge for policy just to break even?
A Regression to predict sodium content from calories had a correlation of r = 0.8781. The calories averaged 168 calories, with a standard deviation of 28.6 and the sodium content averaged 422 mg, with a standard deviation of 114 mg.
Where are we going? How will this course change or impact your life as you seek to live in a complex world of comparative politics?
according to a genetics theory a certain cross of guinea pigs will result in red black and white offspring in the ratio
A large bank has 4500 accounts holders in a particular branch. The rupees amount of these accounts are known to be normally distributed with a mean of Rs. 60,000 and a standard deviation of Rs. 1000.
Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an error of less than 5 units. Standard deviation be 6 units. What would be the required sample size?
A geneticist conducts her survey and calculates hat p = 0.512. Which of the following is the most correct interpretation of this statistic? a) There is a 51.2% chance that a randomly selected gamete cell will have the male chromosome.
Show that the cla ratio for an ideal hexagonal close-packed structure is (8/3{'2 =1.633. If cla is significantly larger than this value, the crystal structure may be thought of as composed of planes of closely-packed atoms, the planes being lo..
In a survey to identify of risk factors for heart disease among men and women were asked about if they ever smoke. Of the 430 men, 116 said they smoke. Of the 380 women, 73 said they smoke. What is the proportion for smoker for men
What role do z-scores play in this transformation of data from multiple distributions to the standard normal distribution? What is the relationship between z-scores and percentages?
Find the 90% confidence interval for the unknown mean operating life of the entire shipment and sketch a figure for the results of part a.
Three chips are then selected at random and without replacement from II. (a) What is the probability that all three are white?
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