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Suppose that you work for the child social services agency in your county. Your job is to investigate instances of possible child neglect or abuse. After collecting your evidence, which may come fro
A group of 14 friends got together for a wine contest. Each guest brought his or her favorite bottle of pinot noir. Each wine was tasted by all 14 guests and scored on a scale from 1 (poor) to 20 (e
Go through the steps for hypothesis testing, figuring out which statistic to use and spelling out each step along the way. Employ alpha = 0.05, and figure out whether you need to do a 1-tailed or 2-
Serious golfers and golf equipment companies sometimes make use of golf equipment testing labs sometimes make use of golf equipment testing labs to obtain precise information about particular club h
A manufacturer of plumbing fixtures has developed a new type of washerless faucet. Let p = P (a randomly selected faucet of this type will develop a leak within 2 years under normal use).
In each of the following situations, the sampling frame does not match the population, resulting in undercoverage. Give examples of population members that might have been omitted.
Use the fact that X bar is the approximately N(sigma, sigma^2/n) to construct an approximate 95 percent confidence interval for sigma.
A researcher wants to determine a 95% confidence interval for the mean number of hours that UMKC students spend doing homework per week. Suppose she knows that the standard deviation for hours spent
In a study designed to test the effectiveness of magnets for treating back pain, 35 patients were given a treatment with magnets and also a sham treatment without magnets. Pain was measured using a
Construct a 95% confidence interval to estimate the actual proportion of taxpayers who filed electronically in 2010. What is the margin of error for this sample?
Construct a 95% confidence interval to estimate the population proportion with a sample proportion equal to 0.60 and a sample size equal to 150.
Construct a 90% confidence interval to estimate the average attendance of an NCAA men's basketball game during the 2009-2010 season.
Does this provide compelling evidence for concluding that more than 10% of all plates blister under such circumstances? State and test the appropriate hypotheses using a significance level of 0.05.
Can not answer because the test statistics also depends on sample standard deviation s which is not given. x = 90 will have a smaller p-value because it provides more support for HA.
How many elephants does the researcher need to weigh so that he can be 80% confident that the average weight of elephants in his sample is within 350 pounds of the true average weight for this subsp
Suppose the average Math SAT score for all students taking the exam this year is 480 with standard deviation 100. Assume the distribution of scores is normal. A SRS of four students is selected and
For each of the following distributions, find the minimum usual value ? - 2? and the maximum usual value ? + 2?.
The t- distribution for developing a confidence interval for a mean has _____ degrees of freedom.
The following data represent the breaking strengths of samples of 20 gauge insulated copper wire from three different suppliers. The researcher is interested in finding evidence that the distribu
In a game, you have a 20% chance of winning $20, a 10% chance of winning $15, a 20% chance of winning $10 and a 50% chance of losing $18. What are the expected values of your winnings?
The standard deviation of mosquitos caught in the entire population of traps is 150 mosquitos. What is the 99% confidence interval for the true mean number of mosquitos caught in all mosquito traps?
How does the normality requirement for a hypothesis test of a claim about a standard deviation differ from the normality requirement for a hypothesis test of a claim about a mean?
A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. What is the 90% confidence interval for the avera
Determine whether the hypothesis test involves a sampling distribution of means that is a normal distribution, Student t distribution, or neither. You may use Figure 7-6 and Table 7-1 in your textbo
A certain baseball player hits a home run in 6% of his at-bats. Consider his at-bats independent events. Find the probability that this baseball player hits more than 32 home runs in 750 at-bats.