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The sample means obtained are X1(bar)=86 and X2(bar)=88. It is known from previous studies that the population variances are 4.8 and 5.2 respectively. Using a level of significance of .10, is there
Your job is to determine how many tickets to sell. Explain your solution completely and write your recommendation to the company.
Ten bolts were selected randomly from a production line and the diameter of each was measured. Why do these diameters not have a binomial distribution?
A department store manager claims that at least 45% of persons who visited this store make a purchase. In a sample of 400 persons who visited the store 150 made a purchase. Test the manager's claim
A machine is designed so as to pack 300ml of a solution with a standrd deviaion of 5ml. A sample of 150 bottles when measure had a mean content of 201.3ml. Test whether the machine us functuioning
Assuming that the manufacturer's claim is correct, what is the probability the mean of the sample is 37,650 miles or less?
You collect data on 455 pitchers for the 1998 baseball season and estimate the following equation using OLS and heteroskedasticity-robust standard errors:
A 95% confidence intercal of the population proportion of american adults believing in reincarnation is (0.25. 0.29). explain how the interval would change if the sample size had been only a forth a
It has been estimated that 25 percent of all university students switch majors within their first two years of starting classes. If a random sample of 500 third year students is taken at a city univ
Find a 95% confidence interval for the porportion of american adults who opposed the death penalty from the confidence interval shown for the porportion in favor.
The center makes over 200,000 outgoing calls per year. There is an operator at the center who places 25 outgoing calls in a one-hour period. What is the probability that this operator will get live
The mileage (in thousands of miles) that car owners get with a certain kind of tire is a random variable having the probability density function f(x) shown below. If the value of y is 11 thousands,
When you completed the sameple you found that 114 of those adults sampled over the age of 24 smoke. Develop a 95% condience interval for the current porportion of adults over the age of 24 who smoke
An investor is to purchase one of three types of real estate. Which investment has the highest EMV? What is the expected value of perfect information in this problem?
Compute and interpret the z-score for each of the six entertainment expenses.
What is the probability that a randomly selected household purchased a DVR, given that the household purchased a plasma-screen television?
What is the probability that the sample mean will be greater than $7,500? If the consulting firm tells you the sample mean for the Medicare enrollees they interviewed was $7,500 would you question
Find a 95% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments available for rent in this community.
How many more sheep should be included in the sample if we want to say with 98% confidence that the population mean weight of the Jacob sheep is within 2.0 lb of the sample mean?
At the .025 level, has Holdlonger increased the shelf life of the chlorine? Estimate the p-value.
The time it takes to give a man a shampoo and haircut is normally distributed with a mean of 22 minutes and standard deviation of 3 minutes. Customers are scheduled every 30 minutes.
A study conducted at a certain college shows that 75% of the school's graduates find a job in their chosen field within a year after graduation. Find the probability that 8 randomly selected gradua
A sample of six college wrestlers had an average weight of 276 pounds with a sample standard deviation of 12 pounds. Find the 90% confidence interval of the true mean weight of all college wrestlers
The lifetime of a DVD player is normally distributed with a mean of 7 years and a standard deviation of 55 months. In a sample of 32 DVD players, what is the probability the average life will be les
To test the null hypothesis that the average lifetime for a particular brand of bulb is 775 hours versus the alternative that the average lifetime is different from 775 hours, a sample of 80 bulbs i