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The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a Normal distribution. This distribution has a mean of 42 and a standard deviation of 7. Using the Standard Deviation Rule, aka the Empirical Rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 21 and 56?
One way the company could solve this problem would be to change the advertising claim. What assembly time should the company quote in order that 60% of customers succeed in finishing the desk by then?
Survey response rate. Pew Research reported in 2012 that the typical response rate to their surveys is only 9%.
Verify that it is appropriate to use the confidence interval method based on the Central Limit Theorem for this problem.
tim gets 15 emails on average per day i.e. per 24 hours. emails arrive randomly and independently.a what is probability
what is a numerial value that characterize some aspect of a population?a. estimatorb. parameterc. statisticd.
construct a one-page description to introduce one-way anova. you need to mention why anova is useful how it is carried
How large a sample should be selected in order to estimate the population proportion to within a margin of error of 0.02 with 97% confidence. The sample proportion from the preliminary sample was 0.18.
Content of 100 randomly chosen cigarettes was 3.1 mg. What is the probability that the sample mean would have been as high as or higher than 3.1 mg if the company's claims were true?
a group of statistics students decided to conduct a survey at their university to find the average mean amount of time
Find the 90% confidence interval for a population mean if the sample mean is 21.6 with a standard deviation of 2.8 for a sample of 35.
Conduct a hypothesis test to verify if the claim that a bottle contains less than sixteen ounces is supported. Clearly state the logic of your test, the calculations, and the conclusion of your test.
What are favourable outcome of probability of the given event: choosing seven numbers that match seven randomly selected balls when
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