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1. How would you describe Hypothesis Testing to a friend outside of this statistics class? minimum 100 words. You may use the information in the texbook or ceate your own problem. Formulas are not required.
2. Students, please review the following topics. Post your answers and discuss amongst your peers about what you learned this week.
a. Consider a binomial random variable where the number of trials is 9 and the probability of success on each trial is 0.43. Find the mean and standard deviation of this random variable.
b. Define "Type I error" in your own words.
c. When should we use the t distribution?
d. How do we find the degrees of freedom when using the t-distribution to estimate or test the mean of a sample from a single population?
e. If my p-value = .035 and my significant level is .05, what do I say about the Null and/or Alternative Hypothesis?
In order to estimate the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one week period.
Either the seed germinates, or it does not. What is the sample space in this problem? Do the probabilities assigned to the sample space add up to 1? Explain. Are the outcomes in the sample space equally likely?
a random sample of forty-three 200 meter swims has a mean time of 3.27 minutes and a standard deviation of 0.07
The use of the ratio li /tr(XTX) as the proportion of total variance accounted for by the ith sample PC has the defect that it lies in the half-closed interval 1≥li ≥0. Show that the statistic
A safety engineer claims that only 40% of all workers wear safety helmets when they eat lunch at the workplace. Assuming that his claim is right, find the probability that at most 4 out of 6 workers randomly chosen will be wearing their helmets wh..
Consumer finance. The data below show, for a consumer finance company operating in six cities, the number of competing loan companies operating in the city (X) and the number per thousand of the company's loans made in that city that are curr..
Many people do not "like" or "trust" single point estimates for things they need measured.
A standard deviation of 4,000 miles. The tires carry a warranty for 35,000 miles. a. What proportion of the tires will fail before warranty expires?
The manufacturer of Winston Tire Company claims its new tires last for an average 40,000 miles. An independent testing agency road-tested 20 tires to substantiate the claim made by the Winston Tire Company.
Working at Company X is very stressful for any human being. Medecines Sans Frontires stepped in to see if there is any possible violations of human rights at the notorious Company X.
a total of 300 participants are selected for a study of risk factors for cardiovascular disease. at baseline study
A coin was flipped twenty times and landed heads fifteen times. Based upon this information, answer the following the question:
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