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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?
In our example of research on lipstick, where E = $2 and S = $29, what sample size would we require if we desired a 99 percent confidence level? What about if we keep the 95 percent confidence level, but decide that our acceptable error is $4?
First-order regression model was fit to data. Part of printout follows?
Formulate and test an appropriate set of hypotheses to determine if the machine can be qualified. Use a = 0.05. Find the P-value.
Assume that the probability for each customer to show up is 92%. (a) What is the probability that someone will be bumped out?
it is estimated that 68 of the voters in the city are against a new sales tax. if 20 voters are selected at random
A director of a social agency is planning to hire temporaty staff to assist with intake. In making plans, the director needs to know whether there is any difference in the use of he agency at different seasons of the year.
A sample of 50 bottles reveals a mean weight of 502.1 ml. Construct and interpret a 90% confidence interval for the mean. Be sure to interpret the meaning of this interval.
consider rolling two fair dice one green and one red. let r be the random variable which determines the face value of
the following data were collected on the height inches and weight pounds of women
They answered in 230 seconds per call with a standard deviation of $40. Can the company claim that they are faster than the average utility?
An average department store sells 350 men's suits per year. The men's suit departments at a particular national chain of stores claim they sell more than the industry average. In 35 of their stores, they sold, on the average, 430 suits per year wi..
Determine the following:Mean, Median and Variance.
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