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Suppose the age distribution in Sydney is as follows:
Under 18: 22%18-25: 18%26-50 36%51-65 10%OVER 65 14%Total 100%
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
q1 use the normal approximation to the binomial to find the probability of x 20 when n 30 and p 0.5.q2 of
Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
A sample of 40 ovservations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observers is selected from a second population.
Expand the above table to show the change in Ms A's investment portfolio over the year, and construct a suitable diagram to illustrate that information.
Suppose a bookie will give you $6 for every $1 you risk if you pick the winner in 3 ballgames. For every $1 bet, you either lose $1 or gain $6. What is the bookies expected earnings per dollar wagered?
Two Sun City had a population of 15,000 in 1985. It was then that Two Sun’s population growth began to rise at a rate of 600 people every year. Based on this model, respond to the following
A survey of the number of calls received by a sample of Southern Phone Company subscribers last week revealed the following information.
Suppose also that the mean score on test A is 85, and the standard deviation is 10; the mean score on test B is 90, and the standard deviation is 16; the scores on the two tests have a bivariate normal distribution; and the correlation of the two ..
a company has estimated that a proposed 10000 investment will generate 3250 for each of the next four years. their
suppose a reputed psychic in an extrasensory perception esp experiment has called heads or tails correctly on ten
The National Highway Association is studying the relationship between the number of bidders on a highway project and the winning (lowest) bid for the project.
two samples of size 25 each yielding x-bar 6.47 sx 1.14 y-bar 6.17 and sy 1.166 show a significant difference
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