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You are the quality manager for a bottling plant. If the filling process is working as intended, cans stamped with 12 oz. will be filled with just over 12 oz.
Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips
The distribution (shape) of the population (e.g., normal, skewed, flat, etc.)
Did you ever purchase a bag of M&M Peanut candies and wonder about the distribution of the colors? A recent article reported that 30 percent of the candies
You are conducting an evaluation of services at a social service agency
Soft drinks are sold in three sizes at a fast-food restaurant- small, medium, and large. Explain why the size of the soft drinks is an example of an oridnal
According to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University
A small pilot study is conducted to investigate the effect of a nutritional supplement on total body weight
A clinical trial is run to assess the effects of different forms of regular exercise on HDL levels in persons
A clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care
In June 2001, 38% of fund managers surveyed believed that the core inflation rate would be higher in 1 year.
Hypothesis testing determines if results are statistically significant. However, marketing managers want to know if research results are practically significant
People spend huge sums of money (currently around $5 billion annually) for the purchase of magnets used to treat a wide variety of pains
Write a paper assessing technology's future effect on the workplace.
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law.
Estimation with the independent-measures t statistic is used to determine how much difference there is between two treatment means or two population means.
Describe some of the issues or concerns (at least three) which would be addressed in deciding how to perform a statistical test of a hypothesis:
Given , H0: µ= µ0, then Ha : ___________________________________ .
NBC TV news, in a segment on the price of gasoline, reported last evening that the mean price nationwide is $1.50 per gallon for self-serve regular unleaded
Could you explain when and why one would use a one sided test vs a two sided test;about what "drives" the selection of one type over the other?
Data on X (net profits after tax in U.S. manufacturing industries [$, in millions]) and Y (cash dividend paid quarterly in manufacturing industries
The management of Discount Furniture, a chain of discount furniture stores in the Northeast, designed an incentive plan for salespeople.
Whenever we perform a statistical test, we calculate a so-called p-value, which ranges between 0.00 and 1.00.
Tesla Motors needs to buy axles for their new car. They are considering using Chris Cross Manufacturing as a vendor
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.