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When 100 students took a test, the average score was 77.1. Two more students took the test. The sum of their scores was 125. What is the new average?
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An oil company determines it costs $25,000 to sink a test well, an oil hit yields a net revenue of $475,000($500,000 gross-$25,000costs), and a natural gas hit yields $125,000 net revenue ($150,000 gross-$25,000 costs). ...
Doctor wants the estimate the HDL cholesterol of all 20 to 29 year old females. How many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confidence assuming o=18.2? Suppose the doctor would b ...
Let a random sample be taken of size n = 64 from a population with a known standard deviation of 15. Suppose that the mean of the sample is 40. Find the 99% confidence interval for the mean of the population from which t ...
Given a trendline of y = 5832x + 135799, where the variable x represents the age of a home (in years) and the variable y represents its current market value (in dollars), use this trendline to predict the current market ...
In a study comparing response rates between treated and non-treated subjects, 60% of subjects are observed to have both responded and been treated. If we also know that a randomization ratio of 2:1 was used (e.g. twice a ...
On August 19, 2004, the Internet search firm Google went public, at an offer price of $85 per share. The IPO was unconventional in that Google used an auction to determine its offer price and sell shares to investors. In ...
Using Excel, A manufacturer of Celsius thermometers claims the thermometers they produce have an average (mean) reading of 0 degrees Celsius and a standard deviation of 1 degree Celsius for freezing water . If one of the ...
Only 35% of the drivers in a particular city wear seat belts. Suppose that 20 drivers are stopped at random what is the probability that exactly four are wearing a seatbelt? (Round your answer to 4 decimal places)
1) Suppose you purchase a 10-year bond with 6.4%annual coupons. You hold the bond for four years, and sell it immediately after receiving the fourth coupon. If the bond's yield to maturity was 5.4% when you purchased and ...
Assume that 50 percent of the students at the university have taken 4 years of high school math. Of those with four years of high school math, 80 percent plan to major in science. Of those without 4 years, only 20 percen ...
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