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1. What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothesis test for the difference in two population proportions? Explain.
Assume we have a population of scores with a mean of 975 and a standard deviation of 15. Assume that the distribution is normal. Provide answers to the following questions:
Why is "rounding-down" the LP solution the suboptimal way to solve Integer programming problems? Can you describe why?
A statistician is interested in determining whether food preferences depend on the country. The data is presented below. What is the correct statistical test for analyzing the data?
Scores ranged from 0 to 40 with higher scores reflecting greater computer anxiety. This variable was measured on the interval scale. The researcher analyzed the data using what t test?
A fair coin is tossed four times and X is number of heads on first three tosses and Y on last three. What is the joint probability mass function of x and y? What is the marginal pmf? Are X and Y independent?
Suppose we wish to estimate the true population of HSB students who own cars. We randomly sample 100 HSB students and find 20 students own a car.
A recent Survey indicated that 18% of America adults were in favor of cloning human embryos. What is the probability that in a group of 30 adult Americans
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
Another day, it took Eric only 12 minutes to get to work. Using the same formula, determine the z value. Is it positive or negative? Explain why it should be positive or negative.
Show the sampling distribution of line over x where line over x is the sample mean annual cost of automobile insurance.
What type of error has possibly been committed? Explain the error in ordinary language.
Suppose these data represent whole population. Determine the population mean and population standard deviation.
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