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1. Explain what is meant by the margin of error for a confidence interval. What error are we talking about in the context of an interval for m?
2. Explain exactly what we mean when we say that a sample of size n makes us 99 percent confident that x is within E units of m.
3. Why do we often need to take a preliminary sample when determining the size of the sample needed to make the margin of error of a confidence interval equal to E?
The normal distribution is a type of probability density function. Areas found under this curve are equivalent to probabilities. For example, the probability that z lies between a and b is denoted P(a
Use critical values to test the hypotheses you set up by setting a equal to .10, .05, .01, and .001. (3) Do we estimate that m is less than 4 or greater than 4?
In a survey of 616 males ages 18-64, 393 say they have gone to the dentist in the past year. Construct90% and95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. If convenie..
Explain the bias and sampling error
In a survey to determine child care costs for working parents, the local Chamber of Commerce randomly samples licensed child care centers in four regions of the metropolitan area. The purpose of the survey is to see whether and how average child c..
In a normal distribution of measurements having a mean of 500 feet and a standard deviation of 50 feet, what percent of the distribution falls between 490 and 520 feet?
Compare and contrast significance levels and p-values.
Analysis of Variance SPSS instructions: Use the five steps of hypothesis testing to determine whether the observed differences in the number of activities in the following table performed by the three groups are statistically significant at the .05 l..
The data in the table below is from a study conducted by an insurance company to determine the effect of changing the process by which insurance claims are approved. The goal was to improve policyholder satisfaction by speeding up the process and eli..
A local corporation was interested in the purchasing habits of Wake County residents.Specifically one of the things they were interested in was the proportions of residents that did a major home improvement project in the last year.
What is the mean number of ducks that are killed and what is the expected number of hunters who hit the duck they aim at?
Compute the mean median, and mode
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