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A company that manufactures precision special-alloy steel shafts claims that the variance in the diameters of shafts is no more than 0.0003. A random sample of 10 shafts gave a sample variance of 0.00027. At the 5% level of signi?cance, test whether the company's claim can be substantiated.
suppose you are tasked to develop a section of the survey measuring home mortgage debt in which survey respondents are
what would be the highest level of measurement to describe the names of a companys new products? ratio interval ordinal
in keno there are 80 balls numbered from 1 to 80 and 20 are chosen at random. if you play a double number you win if
1. the residents of a housing development for senior citizens have completed a survey in which they indicated how
1. for a standard normal model find the z-value that is less than the mean and for which 67 of the area under the
What is the relationship between the sign of the correlation coefficient and the sign of the slope of the regression line?
assume that a sample is used to estimate a population proportion p. find the margin of error e that corresponds to the
In a random sample of 15 Americans 18 years old or older, find the probability that exactly 10 have read at least six books within the past year, Interpret these results.
People were polled on how many books they read the previous year. How many subject are needed to estimate the number of books read the previous year within one book with 99% confidence?
The data show the amounts (in thousands of dollars) of the contracts for soft drinks in randomly selected local school districts. Ata = 0.10, can it be concluded that there is a difference in the averages? Use the P-value method
Calculate the among groups degrees of freedom, determine if the mean ratios for the four neighborhoods are the same?
An estimate is needed of the mean acreage of farms in Manitoba, Canada. The estimate should be correct to within 100 acres with probability 0.95. A preliminary study suggests that 500 acres is a reasonable guess for the standard deviation of farm ..
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