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In a survey to estimate average household monthly medical expenses, 500 households were selected at random from a population of 5000 households. Of the selected households, 336 had children in the household and 164 had no children. A stratified subsample of 112 households with children and 41 households without children was then selected, and monthly medical expenditure data were collected from households in the subsample. For the households with children, the sample mean expenditure was $280 with a sample standard deviation of 160; for the households without children, the respective figures were $110 and 60. Estimate mean monthly medical expenditure for households in the population, and estimate the variance of the estimate
the following eight observations were randomly selected from two populations that were not necessarily normally
1. the random sample of five observations in exercise 1-1 found ? 11.2 and s2 9.2. state your assumptions and
customers at a gas station pay with a credit card a debit card b or cash c. assume that successive customers make
A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. Is there evidence of an improvement on the final?
A bowl with 10 marbles: 2 red marbles, 3 green marbles, and 5 blue marbles. We randomly select 4 marbles from the bowl, WITH REPLACEMENT, that is once a marble is selected, its color is noted and the marble is put back in the bowl (notice this doe..
Solve problem graphically1. Describe optimal solution and objective function value in context of the problem.
According to T-100 Domestic Market, the top seven airlines in the United States by domestic boardings in a recent year were Southwest Airlines with 81.1 million, Delta Airlines with 79.4 million, American Airlines with 72.6 million, United Airline..
Find the probability that out of our batch of 100, with the sampling technique listed above, that (i) both toothbrushes are defective, (ii) that one of the two is defective.
Find the standard score (z-score) for students who study the following hours in a particular week. Round Z to the nearest hundredth and interpret the meaning of each answer as it pertains to this problem.
A t-distribution to create 90% confidence interval for population mean. If convenient, use technology to create the confidence interval.
In order to determine the sum of squares the distance between each data point and the line of the best fit is squared and then all of the squares are summed up. The line of the best fit will minimize this value?
A researcher hypothesizes that people who listen to classical music have higher concentration skills than those in the general population. On a standard concentration test, the overall mean is 15.5. The researcher gave this same test to a random samp..
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