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1. What type of sample is used most frequently in behavioral research?
2. Is it true that valid conclusions cannot be drawn from studies that are conducted on convenience samples? Why or why not?
The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months. What is the minimum and the maximum life expectancy of the middle 95% of the watches?
A sample of 50 male and 50 female infants were put on an experimental infant formula. After two weeks the parents of each infant were asked to fill out a questionnaire concerning infant satisfaction on the formula. One of the questions was "Did Ba..
Determine whether the following situations represent a right, left or two-tailed test: In 1997, 43% of Americans 18 years or older participated in some form of charity work.
Check the validity of the concern by determining a 95% confidence interval for the standard deviation of all drinks dispensed by this machine.
a restaurant has five entrees seven main courses and 10 deserts. in how many ways can you select two dishes on the
Louis Reasoner plans to reorder the cond clauses in eval so that the clause for procedure applications appears before the clause for assignments. He argues that this will make the interpreter more efficient:
At the time she was hired as a server, beth was told, "you can average more than $20 a day in tips." Over the first 35 days she was employed at the resturant, the mean daily amount of her tips was $24.85, with a standard deviation of $3.24.
in a certain noisy factory workers are provided with earplugs and are expected to wear them. an industrial hygienist
Find the point estimate p-hat and the margin of error for the confidence interval (0.444, 0.484)
Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. Find the probability that a randomly selected TV will have a replacement time less than 5 years.
Standard deviation of 200 units. What is the probability (area under standard normal curve) that demand will be greater than 900 units in a given month?
The amount of time the university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
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