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A study of peach trees showed that the average number of peaches per tree was 2000. The standard deviation of the population is 100. A scientist wishes to find the 90% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 10 peaches per tree?
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
What is the appropriate degrees of freedom in this case? Give your answer to four decimal places. What is the lower confidence limit on the interval?
The times for 300 college students of introductory statistics to complete a one-hour times exam.
Researchers at a pharmaceutical company have found that the effective time duration of a safe dosage of a pain relief drug is normally distributed with mean 2 hours and standard deviation 0.3 hour.
The rate of defects among CD players of a certain brand is 1.1%. Use the Poisson approximation to the binomial distribution to find the probability that among 240 such CD players received by a store, there is at most one defective CD player.
Use the population standard deviation along with the sample mean, S, and find a 92% confidence interval for the population mean. Is the true population mean contained in this interval?
Assume we have three different samples each comprised of 20 different jurisdications. Our objective is to compare the seriousness of juvenile substance abuse across all the samples.
Determine the 90% confidence interval for average days worked by employees in all payroll departments?
What value is business research and hypothesis testing to a company? How long should it take a company to complete a scientific research study?
Is the annual average wage of unmarried people (18 - 30) the same as that of married people (31 - 43)?
Assume that a 2005 poll of 1000 American voters found that 76% of Republicans favored ending the tax on dividend income, as did 42% of Democrats and 54% of Independents.
Customers arrive to the company at a rate, on average, of one per hour with a Poisson distribution. The company is staffed by a single individual(the owner) who takes on average 30 minutes with each customer with a standard deviation of 15 minute..
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