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1. A transportation company wants to estimate the average length of time goods are in transit across the country. A random sample of 20 shipments gives x = 2.6 days and s = 0.4 day. Give a 99% con?dence interval for the average transit time.
2. To aid in planning the development of a tourist shopping area, a state agency wants to estimate the average dollar amount spent by a tourist in an exist- ing shopping area. A random sample of 56 tourists gives x = $258 and s = $85. Give a 95% con?dence interval for the average amount spent by a tourist at the shopping area.
3. According to Money, the average home in Ventura County, California, sells for $647,000.9 Assume that this sample mean was obtained from a random sample of 200 homes in this county, and that the sample standard deviation was $140,000. Give a 95% confidence interval for the average value of a home in Ventura County.
Customers enter the waiting line at a cafeteria on a first-come, first-served basis. The arrival rate follows a Poisson distribution, while service times follow an exponential distribution.
When an experiment is conducted, one variable is manipulated to see the impact on another variable -- that's why experiments address causation.
the assembly line that produces satellite radios has historically resulted in a 3 defective rate. a random sample of
Furthermore, it takes about two weeks for an order to arrive from the supplier. What is the average inventory? What is the annual holding cost?
the central limit theorem helps researchers answer questions abouta. sample means for small sample sizes.b. sample
the following is a frequency distribution fo the number of times patience use the call light in a days time. x is the
binary communication system transmits bit 0 or 1 every bit interval. probability of transmitting bit 1 and 0 are
What is the probability of choosing a yellow candy, what is the probability that the candy is blue, red, or green and what is the probability of choosing an orange candy?
Develop a point estimate of the population mean number of units sold per month. Develop a point estimate of the population standard deviation
spencer motors sells automobiles and trucks. the firm makes a 280 profit for each automobile it sells and a 375 profit
sixty percent of all vehicles examined at a certain emissions inspection station pass the inspection. assuming that
A population has mean 325 and variance 144. Suppose the distribution of sample means is generated by random samples of size 36.
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