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The figures above (in thousands of dollars) are weekly expenditures of 56 households in a community.
1) What proportion of the households spend less than $38,000 a week?
2) If the weekly average expenditure of all households is $53,000 but an expert argues that the weekly expenditure is more than $53,000, test his claim at a 5% level of significance and interpret your results.
In this table, my research is about the average amount of money people expect to spend on attomeys when they are injured. Is there a difference, depending on type of injury? Do people expect to spend more when the injury happened in a car, on job,..
Find the standard deviation and variance from the (population) data below. Describe your results.
What is the probability that of today's 1,100 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
One minute follows a Poisson distribution with mean of 1.8. In a 10- minute span of time, what is the probability that the team scores exactly 25 points.
Fixed construction cost for upper-deck area is evaluated to be $1,500,000, with variable cost of $50,000 for each box constructed. Determine the breakeven point for number of luxury boxes in new stadium?
Based on anthropological reports in which the status of women is scored on a 10-point scale, the mean and standard deviation across many cultures are known. A new culture is found in which there is an unusual family arrangement.
In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants results in 58 failures. Does the ..
What are the appropriate H0 and Ha for each of the following research studies? In addition, note whether the hypothesis test is one- or two-tailed.
A researcher selects a random example of college students and measures number of hours they spend watching television per week and their grade point average.
What are the four assumptions for the chi-square tests? What are the hypothesis when conducting the chi-square tests for goodness-of-fit?
Assuming the validity of this premise, among 25 randomly selected current customers, what is the probability that between 2 and 6 (inclusive) qualify for membership?
What is the 95% confidence interval for the proportion of all delinquent customer accounts at this manufacturing company?
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