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1-Can you give a general rule as to what happens with confidence intervals as a function of sample sizes and confidence levels? What are the trade-offs?
2-Take a sample of something in your work environment, something simple, and calculate a confidence interval.
Some possible samples: the average number of people in your unit for the last few weeks; the average number of people in cars you pass on the freeway (be careful - maybe do this when carpooling); the average length of a phone call; the proportion of men vs women that you see in a day.
Does the confidence interval surprise you? Interpret it.
The owner of the Burger Doodle Resturant is considering two ways to expand operation: open a drive-up window or serve breakfast. Th increase in profits reulting from theise proposed expansions depend on weather a competitor opens franchise down th..
Discuss an example where you would use a test of hypothesis with three or more population means (that can be analyzed using ANOVA technique) at your employment or personal life.
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
A social psychologist reports that "in our sample, ethnocentrism was significantly higher (P
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Imagine there are exactly m opportunities to cross safely by the time the nth shock occurs. What is the probability that the mth opportunity is a close call (that it occurs immediately before the nth shock).
Many companies use sampling to determine whether a batch should be accepted. A (n, c) sampling plan consists of inspecting n randomly selected items from a batch and accepting the batch if c or fewer sampled items are defective.
Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of people who smoke is obtained as described below.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
A business owner decides to use a binomial distribution to solve one of his problems. He knows there is a 60 percent probability that he will sell one of his Red Oak floors to any customer who comes into his shop and views the wood.
Develop the opportunitiy loss table and compute the expected opportunity loss for each product. Determine how much the firm would be willing to pay to a market research firm to gain better information about future market conditions.
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
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