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A sport preference poll yielded the following data for men and women. Use a 5% significance level and test to determine if sport preference and gender are independent.
The upper limit of the 90% confidence interval for the population proportion p, given that n = 100; and = 0.20 is
If the plaza is not built, Harry thinks his downtown business will decline about $50,000. Time is of the essence; the mall owners need an answer immediately or he will lose any chance to locate ther
Suppose the scores on an examination are normally distributed with a mean of 45 and a standard deviation of 8. What is the probability that the score of a student will be less than 52.6?
Find an interval centered on the mean in which we can expect at least 85% of the data to fall.
What is the probability that the sample mean FNE score is greater than 17.5? What is the probability that the sample mean FNE score is between 18 and 18.5?
A test for marijuana was tried on 210 subjects who did not use marijuana. The test result was wrong 52 times. Based on the availiable results find the probailbity of a wrong test result for a person w
Twenty of the 100 DVD players an inventory are defective. What is the probability you randomly select one that is not?
Jeff has an opportunity to invest his money. He can make a profit of $8000 with a probability of 0.4, a profit of $ 15,000 with a probability of 0.35, or he could lose $12,000 with a probability of
If the government permanently increases the price of potato chips (through a taxes), how will the price change affect the price elasticity for potato chips over time? Explain
What is the area under the standard normal distribution curve between z = 1.50 and z = 2.50?
For a normal distribution curve with a mean of 17 and a standard deviation of 5, which range of the variable defines an area under the curve corresponding to a probability of approximately 68%?
A certain patient can experience three different types of symptoms Let Ai (i = 1,2,3) denote the event that the patient has a symptom of type i. Suppose that the following probabilities are true.
A spymaster has a network of 7 operatives whom he pays out of a slush fund containing $20000. For accounting reasons, his service requires him to use up his entire fund and to pay his operatives in
What sample mean blood glucose level is higher than 95% of all other sample mean blood glucose levels? Hint: this requires a backward Normal calculation. (Use 2 decimal places)
What is the shape, mean (expected value), and standard deviation of the sampling distribution of the sample proportion for samples of size 225?
A study of 24 graduates of four-year colleges revealed the mean amount owed by a student in student loans was $14,381. The standard deviation of the sample was $1,892. Construct and explain a 90% co
Compute and explain a 99% confidence interval estimate of the population mean number of unoccupied seats per flight
What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample mean for samples of size 40?
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on the shape and the color of the container. Of the 1,400 homemakers sam
Report shows that 45% of all US households owned 2 cars in 2000. Set up the null and alternative hypothesis for testing whether the percentage of households cars has
Assuming that the population proportion p is near 0.3, find the sample size required to construct 90% confidence interval for p with margin of error 0.03. Repeat the same calculations if p is close
It is known that 800 patients received a certain drug, and 75 of them reported and adverse event. Construct a 99% confidence interval for the proportion of patients who experience this adverse effec
Suppose vacationers and business travelers have the following demand for airline tickets from New York to Boston: Price Quantity Demanded (Business Travelers) Quantity Demanded (Vacationers) 150 210