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Giving a test to a group of students, the grades and gender are summarized below
If one student is chosen at random,
Find the probability that the student was male OR got an "B".
A random sample of 35m of the firm's accountants has a mean workday of 8.2 hours with a standard deviation of 0.5 hour. At α = 0.01, can you support the CEO's claim?
Election officials take a random sample of 100 signatures and thoroughly investigate them to find that 84% are valid. Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
an online site presented this question would the recent norovirus outbreak deter you from taking a cruise? among the
Estimate is too low for households in British Columbia. Can the value 0.64 be rejected if a survey of 490 homes in BC yields 331 with one or more lawn mowers?
a study of adverse symptoms in users of over-the-counter pain relief medications assigned subjects at random to one of
According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy and electronically file a 1040 tax form. This distribution of times follows the normal distribution and the standard deviation is 80 minutes.
Four components of a time series are secular trend, cyclical variation, seasonal variation, and irregular variation (Lind, 2005). Briefly describe each of these components and provide a real-world example of one component.
Determine the confidence interval for population mean and the Superintendent wants to determine the average amount of hours per week the student population studies at home.
the pulse rates for 13 adult women were as follows. construct a 0.95 confidence interval for the mean pulse rate. give
1.as part of a promotion for a new type of cracker free samples are offered to shoppers in a local supermarket. the
ken ramsing has been in the lumber business for most of his life. kens biggest competitor is pacific woods. through
What is the probability that the variable will take the value 2? What is the mean of the distribution?
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