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State the hypothesis and calculate the test statistic for proportion:
1. In a random sample of 400 persons who were given a flu vaccine, 136 said that they experienced some type of discomfort. Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
2. Do the data provide sufficient evidence to conclude that the proportion of those who experience some type of discomfort is more than 30%? Answer the question using the following steps
a. State the null and alternative hypotheses.
b. Calculate the test statistics. Show your work.
Compute descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Compute the value of beta for each stock. Which of these stocks would you expect to perform best in an up market? Which..
Data on distribution of cost for building effort, design work and testing effort.
where p is the binomial probability of returning a completed survey, and log is the natural logarithm. The multiple logistic regression output from fitting this model is given below.
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
Determine the probability that between 5 and 10 minutes will pass between successive occurrences.
Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?
Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of people who smoke is obtained as described below.
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
The field of statistics can be roughly subdivided into two areas: descriptive statistics and probability.
Determine the most economical monthly shipping schedule. Provide a table showing the routes and total costs.
In a pilot study, five kids are given several problems of each type to practice (and then tested on three problems), in one of the three Sequences: D-R-T, T-D-R, OR R-T-D.
Fifty raffle tickets are numbered 1 throughout 50, and one of them is drawn at random. What is the probability that the number is a multiple of 5 or 8? Consider the following "solution": Since 10 tickets bear numbers that are multiples of 5 and 6 ..
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