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Exam 19: The Diversity of Samples From the Same Population

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Question 31

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Suppose someone has a theory that 'something interesting is happening' in the population.What type of statistical technique will they most likely use to 'prove' or 'disprove' their theory, a confidence interval or a hypothesis test?

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Question 32

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For Questions , use the following narrative Narrative: cell phone owners Suppose numerous random samples of size 2,500 are taken from a population made up of 20% cell phone owners. -{Cell phone owners narrative} What is the chance that a sample of size 2,500 from this population will contain at least 20% cell phone owners?

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Question 33

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If numerous large random samples or repetitions of the same size are taken from a population, the frequency curve made from proportions from the various samples will have an approximate __________ shape.

For Questions , use the following narrative Narrative: Test scores Suppose that test scores on a particular exam have a mean of 77 and standard deviation of 5, and that they have a bell-shaped curve. -{Test scores narrative} Suppose you take a single random sample of size 100 people from this population.What is the chance that their average test score will be above 77?

For Questions , use the following narrative Narrative: cell phone owners Suppose numerous random samples of size 2,500 are taken from a population made up of 20% cell phone owners. -{Cell phone owners narrative} What is the chance that the proportion of cell phone owners in a sample of size 2,500 from this population will be more than two standard deviations from the expected mean?

Which of the following statements is false?

For Questions , use the following narrative Narrative: Test scores Suppose that test scores on a particular exam have a mean of 77 and standard deviation of 5, and that they have a bell-shaped curve. -{Test scores narrative} Suppose you randomly select a sample of size 100 from this population.Where would you expect their average test score to fall? Compare your answer to what you would expect from a single individual selected at random from this population.

For Questions , use the following narrative Narrative: cell phone owners Suppose numerous random samples of size 2,500 are taken from a population made up of 20% cell phone owners. -{Cell phone owners narrative} How would the frequency curve made from proportions of cell phone owners from the various samples of size 2,500 compare to the frequency curve made from proportions of cell phone owners from the various samples of size 250?

If numerous large random samples or repetitions of the same size are taken from a population, the frequency curve made from proportions from the various samples will have what approximate shape?