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Home mortgage interest rates for 30-year fixed rate loans vary throughout the country. During the summer 2000, data available from various parts of the country suggested that the standard deviation of the interest rates was .096 (The Wall Street Journal, September 9, 2008). The corresponding variance in interest rates would be (.096) 2 = .009216. Consider a follow-up study in the summer of 2001. The interest rates for 30-year fixed rate loans at a sample of 20 lending institutions had a sample standard deviation of .114. Conduct a hypothesis test using Ho:o2=.009216 to see whether the sample data indicate that the variability in interest rates changed. Use a=.05. What is your conclusion?
LSAT scores are normally distributed, with a mean of 150 and s = 10.
A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n= 25 third grade children and each child is given a standardized achievement test at the end of the year.
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
Ten prominent citizens have been nominated for a community's "Citizen of the Year" award. First- and second-place trophies are awarded to the two persons receiving the highest and second-highest number of votes.
In the following observational studies, describe changes that could be made to the data collection process that would result in an experiment rather than an observation study. Also, offer suggestions about unseen biases or lurking variables that m..
Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class. Compare the values and explain what can be concluded based on the numbers.
Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? Let p1 refer to the urban population.
What are examples in which non-parametric tests are used to analyze business related problems in general, and more specifically, problems related to marketing?
What type of error would result in that case? Respond to at least two of your classmate's postings.
3 voters are randomly selected (with replacement) from a group of 1,500 people. The group is known to be 20% republican. What is the probability that all of them are republicans?
The probability of an randomly selected person quits a team is 0.125. Assume the team has n members. Determine the smallest n that the team needs to have if the probability of the team has at least 20 members left is 0.9.
An entomologist writes an article in a scientific journal, which claims that fewer than 7 in ten thousand male fireflies are unable to produce light due to a genetic mutation. Use the parameter p, the true proportion of fireflies unable to produce..
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