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The distribution of marks in a statistics exam is approximately normal with mean and standard deviation 17. What should the pass mark be set at if 15% are to fail? If the examiner wishes to grant the top 20% A's, what should be the cut-off mark for an A?
The number of lightning strikes in a year at the top of a particular mountain has a Poisson distribution with a mean of 4.2. Find the probability that in a randomly selected year, the number of lightning strikes is 0.
Normal with a standard deviation of 0.3 inch. How does the diameter of an orange at the 67th percentile compare with the mean diameter?
If the sample mean is 15.2 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
Rosa's Italian restaurant wants to develop forecasts of daily demand for the next week. Develop a forecasting chart, using MS Excel. Include the steps used in your forecast.
Mean of 2.25 ounces and a standard deviation of 0.15 ounce. 77% of the apples will contain at least how many ounces of juice?
Include the null and alternative hypothes, name the test being used, find the correct test statistic, the critical statistic, and a diagram.
Describe in some detail how a hypothesis test could be used in some real world context such as business, politics, church, Girl Scouts, school, or perhaps your place of work.
Sketch the distributions involved, and (c) explain your answer to someone who is familiar with the t test for a single sample but not with the t test for independent means.
Of the next 15 people that invest in this project, what is the probability that 5 or less people will result an annual net cash flow of at least $100,000.
Analyze the process of statistical quality control and determine which part of the process would be most difficult and what steps could be taken to mitigate the anticipated difficulty.
The State Game Commission set on length, if it is desired that 91% of the fish caught may be kept by fisherpersons? There is no limit on size for trout that exceed the minimum.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
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