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Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample
How many subjects need to be enrolled in each group to achieve 80% power using two-sided test with significance level=0.05?
Your polling company wants to conduct a presidential preference poll of the citizens of Ohio to predict which candidate will win the election.
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year.
Describe the relationship between the confidence level and the size of the sample needed to estimate p within 1.5 percentage points.
A system consists of five identical components connected in series as shown
A survey is being planned to estimate, with a 98% confidence interval, the mean amount of time per week that seniors spend watching television.
Briefly describe your area of research interest (1-3 sentences is sufficient).
In the 1936 presidential election, Alfred Landon was predicted (incorrectly) to beat Franklin D. Roosevelt based on the results of a telephone survey.
Opinion Research International surveyed people whose household incomes exceeded $50,000 and asked each for their top money-related.
How is sample size related to statistical tests and outcomes? Give a specific example. Why is it important to plan the sample size before collecting data?
What is more useful for computing and understanding a measure of something, the average deviation or the standard deviation? Why?
A door-to-door sales person for a household appliance has learned from her past experience that out of ten demonstrations of her appliance.
Summation of squared deviations scores for Test 2
Use the confidence interval to find the estimated margin of error. The find the sample mean.
Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $45,000.
A "random survey" was conducted of 3274 people of the "microprocessor generation" (people born since 1971, the year the microprocessor were invented).
A given population proportion is .25. For the given value of n, what is the probability of getting each of the following sample proportions?
According to the 2009 National Survey on Drug use and Health, among people age 12 or older who reported using pain reliever non-medically in the past year
A personnel manager at a large firm needs to estimate the mean length of stay, ? of its employees.
In a regression analysis, the error term ? is a random variable with a mean or expected value of
Due to financial hardship, the Nyke shoe company feels they only need to make one size of shoes, regardless of gender or height.
What is the margin of error of your estimate of the population mean at a 95% confidence level?
What is the r value for the relationship between Hamstring strength index 60°/s and the Shuttle run test? Is this r value significant?
In a production run of 300 units, there are exactly 20 defective items and 280 good items.