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The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.
Describe the "third variable problem" as it relates to correlation and provide an example of how you might see this played out in your own field.
Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead
In a two-population test, when will you use paired samples?
Search and identify the surveys, assessment tools or instruments you would consider to gather data on the variables
A researcher compares men's and women's attitudes toward "road rage." Specifically, college students are asked to read a brief scenario
Bednets to Reduce Malaria - In a randomized controlled trial in Kenya, insecticide-treated bednets were tested as a way to reduce malaira
Metropolitan Research, Inc., a consumer research organization, conducts surveys designed to evaluate a wide variety of products and services
The following data represent the actual amount of soda in a sample of fifty 2-liter bottles.
Independent simple random samples from two groups of patients used in an clinical trial yielded the following measurements on glucose levels following
It is desired to test H0: u=50 against H1: u<50 using alpha=0.1. The population in question is uniformly distributed with standard deviation 20.
Here are heart rates for a sample of 30 students before and after a class break. At alpha =.05, was there a significant diffeence in the mean heart rate?
A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40.0 hours.
The production manager at Bellevue Steel, a manufacturer of wheelchairs, wants to perform a second analysis of the number of defective wheelchairs
Identify the null and alternative hypothesis, test statistic, P-value,critical values and state the final conclusion that addreses the original claim:
Families of size 4 spent a population mean of $360 on a visit to an amusement park, standard deviation of $50 in October 2000.
For each of the following , indicate whether the factor influences the numerator or denominator of the z score
In a recent year, some professional baseball players complained that umpires were calling more strikes than the average rate of 61% called the previous year
The following data represents the running time of films produced by 2 motion picture companies. Assume these are independent samples
Determine the minimum required sample size if you want to be 95% confident that the sample mean is within 3 units of the population mean
Based on what we know about statistics and using your example, how do you believe statistics can enrich and represent the results of a study?
Consider the file data on Taxes that is included in worksheet P2 on the exam template. This data represents property taxes paid by 170 residents
A random sample of 35 days taken at a large hospital shows that an average of 44 patients was treated in the emergency room per day.
Analyze the test data (for the assays given above A, B, C, C, D, E) at the 1, 5, 9 month time points.