A milk company has four machines that fill gallon jugs with milk. The quality control manager is interested in determining whether the average fill for these machines is the same. The following data represent random samples of fill measures (in quarts) for 19 jugs of milk filled by the different machines. Use a = .01 to test the hypotheses. Discuss the business implications of your findings....

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Jul 16 2021

n experiment tested the effects of package design and shelf display on the likelihood of buying a breakfast cereal. Package design and shelf display were varied at two levels each, resulting in a 2 × 2 design. Purchase likelihood was measured on a seven-point scale. The results are partially described in the following table: a Complete the table by calculating the mean square, F, significance of...

Jun 28 2021

Problem 1: A research laboratory was developing a new compound for the relief of severe cases of hay fever. In an experiment with 36 volunteers, the amounts of the two active ingredients (A & B) in the compound were varied at three levels each. Randomization was used in assigning four volunteers to each of the nine treatments. The data on hours of relief can be found in the following .csv file:...

Apr 24 2021

An article in Bioresource Technology [“Medium Optimization for Phenazine-1-carboxylic Acid Production by a gacA qscR Double Mutant of Pseudomonas sp. M18 Using Response Surface Methodology” (Vol. 101(11), 2010, pp. 4089-4095)] described an experiment to optimize culture medium factors to enhance phenazine-1-carboxylic acid (PCA) production. A 25 1- fractional factorial design was conducted with...

Apr 22 2021

Discuss how the ANOVA model can be conceptualized as both an extension of univariate t-tests, as well as a special case of the wider regression model.

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Apr 02 2021

Seto and Brandon’s mothers contracted rubella (German measles) during different weeks in their first trimester of pregnancy. Seto has heart problems; Brandon has hearing problems. Which teratogenic principle is illustrated here?

Apr 01 2021

A remotivation team in a psychiatric hospital conducted an experiment to compare five methods for remotivating patients. Patients were grouped according to level of initial motivation. Patients in each group were randomly assigned to the five methods. At the end of the experimental period the patients were evaluated by a team composed of a psychiatrist, a psychologist, a nurse, and a social...

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Jan 21 2021

During the summer at a small private airport in western Nebraska, the unscheduled arrival of airplanes is Poisson distributed with an average arrival rate of 1.12 planes per hour. (a). What is the average inter arrival time between planes? (b). What is the probability that at least 2 hours will elapse between plane arrivals? (c). What is the probability of two planes arriving less than 10 minutes...

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Dec 21 2020

"Adults who stutter: Responses to Cognitive Stress," published in the Journal of Speech and Hearing Research in 1994, reported that speech rate, in words per minute, for 9 stutterers under conditions of stress head mean 52.6 and standard deviation 3.2 a) Use the fact that the t multiplier for 8 degrees of freedom at 99% CI is 3.36 to construct a 99% CI for mean speech rate of all stutterers under...

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Dec 21 2020

Stopping Distances the U.S. Department of Transportation (DOT) tests the braking abilities of various cars. For this experiment, DOT measured the stopping distances on dry pavement at 100 kph (kilometers per hour, about 62 mph) of four models: a Chevrolet Malibu, Toyota Camry, Pontiac Grand Am, and Cadillac Devilled. Each car accelerated to 100 kilometers per hour on a test track; then the brakes...

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Dec 09 2020

- Basics of Statistics
- Sampling Theory
- Descriptive Statistics
- Central Tendency
- Hypothesis Testing
- Regression
- Time Series Analysis
- Applied Statistics
- Operational Research
- Stochastic processes
- Statistics - Others
- Theory of probability
- Correlation, Regression
- Biostatistics
- Statistical Quality Control
- Quantitative Analysis
- Markov Analysis
- Forecasting
- Stratified Random Sampling