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According to the U.S. Bureau of Labor Statistics, personal expenditures for entertainment fees and admissions averaged $349 per person in the Northeast and $420 in the West. Assuming that these data involved (1) sample sizes of 800 and 600 and (2) standard devia- tions of $215 and $325, respectively, use a z-test and the 0.01 level of significance in testing the difference between these means. Determine and interpret the p-value for the test. Construct and interpret the 99% confidence interval for the test.
Source: U.S. Bureau of Labor Statistics, Consumer Expenditure Survey, Interview Survey, annual.
the study found 87 per cent of 1500 australians surveyed would support colour-coding on packaged food to indicate
consider a parallel system of 3 components the system functions as long as at least one of its components functions.
in a small city approximately 31 of those eligible are called for jury duty in any one calendar year. people are
What is the null hypothesis? Use a = 0.05 .
Find the percentage of the 1000 enemy that will be destroyed.
Why do we care whether the assumptions required for statistical tests are met? (Tip: You might also want to write your answer on a note card you paste to your computer.)
the acme light bulb company claims that the lifetimes of its 100-watt light bulbs follow a normal distribution with a
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
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Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 30. Change the number from 30 to 10 and recalculate the confidence interval.
Fewer than 30 individuals watched a movie at home this week ? b) More than 42 individuals watched a movie at home this week ?
tasks are sent to a supercomputer at an average rate of 6 tasks per minute. their arrivals are modeled by a binomial
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