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a multiple choice test has 80 questions, each with 4 possible answers, of which only 1 is correct. What is the probability that sheer guesswork yields betwenn 25 to 30 correct answers for the test (assume the student has no knowledge of the problems). Be sure to justify why you can use the method you do.
Compute Cohen's d to measure effect size for both test ( standard deviation 20 and 10) If the population standard deviation is 10.
A company requires its secretarial employees to demonstrate his/her ability to type more than 45 words per minute in a typing test.
There are 3 radar stations and the probability of a single radar station detecting an enemy plane is 0.65. What is the probability of 2 stations detecting an enemy plane? Round your answer to nearest hundredth.
According to an Internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is selected at random, find the probability that none of them enjoy drinking beer.
Find a 90% confidence interval on the difference in the mean number of production units for the two shifts.
Find out the constant using probability density function also cumulative distribution function. Assume X be a continuous random variable with probability density function.
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
Developing a linear programming problem using Commuter Bus scheduling to minimize the total cost.
Index number acts as a barometer for measuring the value of money. What are the characteristics of an index number? State its utility.
How might variance and standard deviation be applied to a real-world business-related problem? Provide a specific application in which these measures are useful.
The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Use Chebyshev's theorem to answer the following questions.
Based on your answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
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