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The mean age of 25 randomly selected college seniors was found to be 23.5 years, and the standard deviation of all college seniors was 1.3 years.
A sample of 25 concession stand purchases show a mean purchase of $5.29 with a standard deviation of $3.02
A coin-operated drink machine was designed to discharge a mean of 8 ounces of coffee per cup.
Suppose that a one-tailed t-test is being applied to find out if the population mean is less than $212. The level of significance selected is 0.01 and 2
In a study of the lizard Sceloporis occidentalis, researchers examined field-caught lizards for infection by the malarial parasite Plasmodium.
How can you tell when you should use the ANOVA versus a t-test? What is one problem with using the ANOVA when the t-test is the appropriate data analysis?
In the past, young women drivers have maintained a better driving record than young men drivers. An insurance company is concerned with the driving record
A financial planner wants to compare the yield of income- and growth-oriented mutual funds. Fifty thousand dollars is invested in each of a sample of 35
A group of 20 sales associates agree to go through a week-long sales class to improve their productivity. The amount of their sales are computed for one month
A month of sales data are collected on sales of different types of computer products. Run the t-tests to determine:
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1050 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1030 hours
Silver Gym's aerobic class grew so large that the class had to be split in half and offered on two different nights. Silver also hired a new aerobic leader
Suppose you want to test the claim that population mean µ=3.5. Given a sample size of n=34 and a level of significance of a=0.01, when should you reject Ho?
Imagine that stimulus students are asked to indicate how likely they are to use a new breakfast-food/ toothpaste combination
The engineer in a widget factory wants to test out a new form of raw materials. So a batch of widgets are made in the old manner as a control
Implement raw data tables and computations, using both graphical and tabular methods of displaying data and results
Members of the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college
Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels
Medical researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic mental illness
Harold operates a hot dog stand at the Jugulars football games. He pays $2000 per game to rent the space. Each hot dog (with bun and condiments)
At a retail store, customer survey is South Dallas the average household income of 75 household showed $90K with standard deviation of $25K
Survey showed 75 new employees hired at one employment place had an average salary of $60K with standard deviation of $20K.
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift
At alpha (a) =.05, does the following sample show that daughters are taller than their mothers?
Use the sample data below to conduct a chi-square test to determine if getting into an accident and the color of car are independent.