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Question: Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Use the p-value method for testing hypotheses. Identify the null and alternative hypotheses, test statistic, p-value, critical value, and state the final conclusion.
Listed below are body mass indexes (BMI) for recent Miss America winners.BMI: 19.5, 20.3, 19.6, 20.2, 17.8, 17.9, 19.1, 18.8, 17.6, 16.8
Use a 0.01 significance level to test the claim that recent winners are from a population with a mean BMI less than 20.16, which was the BMI for winners from the 1920s and 1930s. Do recent winners appear to be significantly different from those in the 1920s and 1930s?
Give an example of how you may use multiple regression to answer a question related to the impact of leadership change on employee attitudes scores, teambuilding training and performance outcomes.
At a certain university, the average cost of books per student was 400.00 last semester. In a sample of 40 students this semsester, their average cost was 340.00 with a standard deviation of 80.00.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
It's estimated that 57% of Americans live in households with 1 or 2 people, 32% live in households with 3 or 4 people and 11% live in households with 5 or more.
The Appliance Center sells a variety of electronics equipments and home appliances. For last four years the following quarterly sales (in $ millions) were recorded.
Would this be a T-value distribution? Can you take me through the steps to determine upper and lower limits of a 95% confidence interval?
Assume we know the length of time a battery will hold a charge is a normal distribution with a mean of 50 hours and a standard deviation of 15 hours.
There is pretty good chance average number of days absent would be 12 or more. That is what occurred to us - chance variation." Is this good defense? Justify the answer.
Flip the tree. Label all endpoints, supply all branch probabilities, and calculate and label an endpoint probabilities.
A random sampling of financial analysts was asked to provide forecasts of earnings per share of a corporation's stock for the next year. The results are summarized as follows:
Be sure to show whether you use the t- or z- value, and what value you use. Interpret the confidence interval in a single sentence. In another sentence, state why you used either the "t" or the "z".
Ten people agree to take part in an experiment designed to determine whether a persons weight differs between morning & evening.
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