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Published byWendy Berry Modified over 4 years ago

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Review from before Christmas Break

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Sampling Distributions Properties of a sampling distribution of means:

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Sampling Distributions Properties of a sampling distribution of proportions:

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About 13% of the population is left-handed. What’s the probability that less than 10% of a class of 50 is left-handed?

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The mean adult weight is 175 pounds with a standard deviation of 25 pounds. Assumption of normal is appropriate. What is the probability that I randomly choose a person who is more than 200 pounds?

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The mean score on a standardized test is 120 with a standard deviation of 15 points. What’s the probability that a group of 40 people will have a mean score of at least 128.

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Approximately 28% of the population would like a new house. What’s the probability that at most 40 out of 150 people interviewed will want a new house.

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In May 2002, the Gallup Poll asked 537 randomly sampled adults the question, “Do you believe the death penalty is applied fairly or unfairly in this country today”. Of these, 53% said “fairly”. Find a 90% confidence interval for the proportion of US adults who agree.

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Suppose a simple random sample of 150 students is drawn from a population of 3000 college students. Among sampled students, the average IQ score is 115 with a standard deviation of 10. What is the 99% confidence interval for student’s IQ scores?

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What happens to the interval if I go from a 92% confidence interval to a 99% interval using the same sample size?

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If I keep the same confidence level (92%), but increase the sample size by 100, what will happen to the interval?

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Explain what a 90% confidence interval is.

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Explain what a 90% confidence level is.

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Standard Error It’s the estimated standard deviation of the statistic

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Homeworok Worksheet

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