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Suppose that you want to estimate the average age of the residents in your community.
a. Is this number a parameter or a statistic? Explain.
b. Suppose that you take a sample of people attending a local church on Sunday morning. Would you expect this sampling method to be biased for estimating the average age of community residents? If so, in which direction? Explain.
c. Suppose that you take a sample of drivers as they arrive at a local daycare facility. Would you expect this sampling method to be biased for estimating the average age of community residents? If so, in which direction? Explain.
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
Many people believe that criminals who plead guilty tend to get lighter sentences than those who are convicted in trials. The accompanying table summarizes randomly selected sample data for San Francisco defendants in burglary cases. All of the su..
At the 5% level of significance, test whether the proportion of internet users paying bills online is now more than 50%.
Perform hypothesis testing on one variable's data.
Let X be a random variable uniformly distributed on the interval (0,1). Let Y be a new random variable defined as Y = X2. What is the probability density function of Y given by?
the times for the mile run of a large group of male college students are approximately normal with mean 7.11 minutes
The Money & Investing section of The Wall Street Journal contains a summary of daily investment performance for stock exchanges, overseas markets, options, commodities, futures, and so on.
Using the population standard deviation of 1.4 ounces, find the sample size required if we want our margin of error to be less than 0.25 ounces with 95% confidence.
In a BMT class test the scores of 8 students are: 11; 10; 6; 3; 11; 10; 9; 11. Assume the sores are a simple random sample from a normally distributed population. What is the point estimate of the standard deviation?
The Swansons are planning to fly to Hawaii from Toronto with a stopover in Los Angeles. There are five flights they can take between Toronto and Los Angeles and ten flights between Los Angeles and Hawaii.
Identify your research question, your research (alternative) hypothesis, and your null hypothesis. Also, identify your independent and dependent variable.
Body mass index is measures at the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI. 25 27 31 33 26 28 38 41 24 32 35 40.
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