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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.
a medical test for malaria is subject to some error. given a person who has malaria the probability that the test will
1. consider the trials involved with flipping a fair coin. its reasonable to assume that coin flips are independent.
Identify the parameter when converting a problem statement from verbal to numerical? Why do null and alternative hypotheses have to be mutually exclusive?
You're interested in determining the volume of sales dollars necessary for the coming year to reach the break-even point. You've decided to break down the sales for the club into four categories, they are as follows:
This problem related to Basic Statistics and it is about computing the change in the average expenditure on students of a school in two years. The change in average expenditure needs to be noted
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured
a skeptical paranormal researcher claims the proportion of americans that have seen a ufo p is less than 1 in every one
the probability that a doctor correctly diagnose a particular illness is 0.7. given that the doctor makes an incorrect
Calculate the expected value of this undertaking (make sure to take into account the thief's initial wealth).
Explain why those rates may be more meaningful as a measure of change across time than the actual numbers of those events.
question cellulon a manufacturer of a new type of home insulation wants to develop guidelines for builders and
Suppose n = 1000 persons are to be sampled from this population and the sample proportion of married persons (ρ-hat) is to be calculated. What is the mean of the sampling distribution of ρ-hat?
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