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Samples and Statistical Inference
Statistics deals with data. The quality of statistical inference depends on the quality of the data collected.
Sometimes data is easy to collect, at other times it may not be as easy. Sometimes in the real world the number of things/people we want to collect data from or about are so huge and we have to make decisions on how this can be done in as reliable a manner as possible.
A chocolate manufacturing company wants to check the quality of their chocolates. Explain how you would go about the process of choosing a sample to conduct the research indicated. Use the questions listed below to format your responses.
In the boom years of the late 1990s, it was often said that rapidly increasing stock prices were responsible for much of the rapid growth of real GDP. Explain how this could be true, using aggregate demand and aggregate supply analysis
Conduct a two-tailed hypothesis test given the information below. Assuming that the population variances are equal for male and female Grade Point Averages (GPAs), use the following sample data to test.
A teacher gave a 25 question multiple choice test. After scoring the tests, she computed a mean and standard deviation of the scores. The standard deviation was 0. Based on this information
The given level of significance is an alpha of .005. Your MSA is 6,200 and your MSW is 1,000. Will you reject your null hypothesis that all population means are equal or will you not reject?
What is the probability of at least three hacker attempts during a month? What is the probability of a hacker attempt occurring every 15 days or less (assume a 30 day month).
Completion of today's paper. If X denotes the number of papers belonging to seniors among those checked, will X have a binomial distributuin?
Can we conclude there is a difference in mean number of surgeries performed by hospital or by day of week?
Compute the probability of seven consecutive points falling above the centerline given a stable process. Is this probability associated with type I or type II error?
Given the following values 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and x and y form a linear equation in one variable, a equation in two variables, a quadratic equation a polynomial of three terms
The speed with which utility companies can resolve problems is very important. GTC, the Georgetown Telephone Company, reports they can resolve customer problems the same day they are reported in 70 percent of the cases.
Suppose it is desired to estimate the population mean number of miles with a margin of error of ± 2 miles at 95% confidence. Do the data provide this desired level of precision? What action, if any, would you recommend be taken?
Find the average age at which people will experience their first cardiac incident, given that 17% of all initial cardiac incident victims are younger than 50. Please, interpret the result.
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