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A simple random sample of 60 households in City 1 is taken. In the sample, there are 45 households that decorate their houses with lights for the holidays. A simple random sample of 50 households is also taken from the neighboring City 2. In the sample, there are 40 households that decorate their houses. We wish to estimate the difference in proportions of households that decorae their houses with lights for the holidays with a 95% confidence interval.
What is the sandard error of the difference in sample proportions?
A. 0.040
B. 0.0795
C. 0.0802
D. 0.1125
Calculate the standard deviation of the sample mean for samples of size 1, 4, 25, 100, 250, 500, 1000, and 5000. Graph your results with the sample size on the x axis and the standard deviation on the y axis.
There a flu epidemic that is spreading across SF County. You are a principle and are in charge of 32 teachers. You want to plan ahead and be able to estimate how many substitute teachers the school may need during this epidemic.
clifford likes dogs. he wondered how much dog owners spend on their dogs in a year. he hypothesized that dog owners
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Event A occurs with probability 0.2. Event B occurs with probability 0.3. Event C occurs with probability 0.4. If A, B, and C are disjoint, then
The following table gives the approximate age distribution in the United States from the 2000 census.
To speed up the process in a blood testing procedure, blood samples from 3 people are combined into one mixture. The mixture will on test negative if all individual samples are negative. If the probability than an individual sample tests positive ..
That's a much larger sample than standard sample surveys. In spite, we cannot trust result to give good information about any clearly defined population. Explain why?
question a study recently reported that the average age of a female shareholder is 44 years. a broker in adelaide wants
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