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Runner's World reports that the time of the finishers in the New York City 10-km run are normally distributed with a mean of 61 minutes and a standard deviation of 9 minutes. Find the proportion of runners who take more than 70 minutes to finish. Draw a sketch to show this proportion.
A Pew research poll was conducted to investigate opinions about global warming. The respondents who answered yes when asked if there is solid evidence that the earth is getting warmer were then asked to select a cause of global warming.
If the data were collected for a sample of 50 households rather than 100, develop an 85% confidence interval estimate of the population mean annual amount spent, assuming the population has a normal probability distribution.
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1% (indicate which test you are performing; show the hypotheses, the test statistic and the critical values and mention whether one-tailed or..
Please describe and define what the chi-square analysis is, the conditions under which it is used, and how it compares to the Pearson Correlation.
If the average tax payer who makes $140,000 per year owes the government $18,200 with a standard deviation of $1500, and the IRS receives a 1040 tax documents from a customer who earned $140,000 that claims he only owes $12,000, should the IRS sus..
Of 346 vending machines tested, 12 are found to be defective. Construct the 98 % confidence interval for the proportion of all defective vending machines.
It is believed that population standard deviation is 15 days. If test is conducted using a 0.05 level of significance, what conclusion must be reached?
Use an alpha level of .01 and test the hypothesis that the two methods are producing the same mean.
Compare the unconditional probability of having the disease to the conditional probability of having the disease given the test says you have the disease.
We are 95% confident that the proportion of non sell-able items for Whole Fruits is anywhere between 6.4% and 15.6% HIGHER than the proportion of non sell-able items for Green Grocer.
Calculate the mean and standard deviation for this set of data. Convert your answer back to dollars and cents and give the correlation value between number of beers consumed and BAC?
Why is it significant to be familiar with frequency distributions in the business world? Provide examples by using a distribution chart from a set of data.
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