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Given below are the values taken from a normal population.
21 23 25 27 28 35 30 32 33
Determine a 95% confidence interval for the population variance.
While some teenagers received no allowance, others reported receiving $200 per week. Based on this information, the mean allowance for U.S. teenagers is most likely 0 $50.
Define validity and reliability. How can we insure our data is both reliable and valid? Which of these two do you think is the more important?
The time required to do the job is normally distributed and has a mean time of 28 minutes with a standard deviation of 5 minutes. How much time should the employer allow employees to finish the job?
Two automatic dispensing machines are being considered for use in a fast-food chain. The first dispenses an amount of liquid that has a normal distribution with a mean of 11.9 ounces and a standard deviation of 0.07 ounces.
explain the purpose of a null hypothesis. why are both a researchalternative hypothesis and a null hypothesis
What does the intercept mean in this context? What is the estimated percent decline in visual field per year?
"If you took 40 employees at random from the corporation, there is a pretty good chance the average number of days absent would be 12 or more. That's what happened to us - chance variation." Is this a good defense? Justify your answer.
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
Due to financial hardship, the Nyke shoe company feels they only need to make one size of shoes, regardless of gender or height. They have collected data on gender, shoe size.
Tungsten content of the mined mineral. Further mining of the drift would be justified if the grade is above 1.25% W; can we be 95% confident that this is the case?
In a study of the differentiation process, 26 juvenile animals were reared in smooth plastic trays, 18 were reared in trays containing several oyster chips, and 23 were reared in trays with only one oyster chip.
suppose 240 people are being tested for a disease with a 100 accurate test. each individual has a 7 probability of
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