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A researcher claims that average age of people who buy lottery tickets is 63. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 5. At a = 0.05 is there
Compute a point estimate and confidence interval for the restaurant expenditure by people in the state whose food store expenditure is $5 billion.
It has been conjectured by U.S. Census Bureau that "approximately 60% of foreign-born people who live in U.S. aren't naturalized citizens". Assume that in a national random sample of 70 foreign-born
If a particular shipment of thousands of components actually has a 5% rate of defects, what is the probability that this whole shipment will be rejected?
Suppose that the average full time college student in the U.S. needs a total of $10,500 per year to cover the costs of tuition, books and fees with the standard deviation of $1,300. If 50 full time
Determine the probability that the average age of these 40 airplanes is at least 14 years old? Round your answer to 4 decimal places. Remember to round your z-value to two decimal places.
Estimate the percentage of variation in observed values of the response variable stated by the regression.
A sample of 2000 union members was selected and there opinions about a proposed management union contract was were recorded. 1600 members were in favor of it. A 95% confidence interval for populatio
The population proportion is .30. Determine the probability that a sample proportion will be within .04 of the population proportion for each of the following sample sizes?
A population proportion is .40. A simple random sample of the size 200 will be taken as well as the sample proportion > will be used to determine the population proportion.
Suppose that you wish to determine a population proportion, p. For the given margin of error as well as confidence level, determine the sample size required.
Assume a fair, six-sided die is rolled ten times. Determine the expected number of faces which fail to appear in ten rolls?
Employ the one-proportion z-test to perform the specified hypothesis test.
Assume a contractor is going to bid on the project but the days to completion, X, is a rv whose probability distribution follows the pmf tabulated below:
A lot of 10 items has three nonconforming units (NCUs). Draw a simple random sample of size n = 3, and let X denote the number of defective items.
The proportion of the auditors hired last yr is to be estimated in 4%. The 90% confidence level is to be used. A similar study for 2010 revealed that the percentage of auditors was 34%. Determine th
When supermarket customers are offered free samples,they take them 60% of time. When 317 customers are observed, determine the probability that more than 180 will take a sample?
Examine the output above to estimate what percentage of Americans take vacations between 15 and 24 days. What percentage of Americans will take more than 11 days? If 1000 Americans were polled regard
Determine the mean, median, mode, sample variance, and range. Do you think that this sample might have come from the normal population? Why or why not?
System A because in shows more consistency in the measuring the average waiting time. System B because in shows more consistency in measuring the average waiting time. Either because their mean waitin
According to figures from us census bureau, the percentage of people under age 18 was 23.5% in new york city, 25.8% in Chicago, as well as 26.0% in LA. If one person is choosen at random from each c
At the local middle school, 60% of students are enrolled in choir or band. If the random sample of five students is taken, determine the probability that all five students are in choir or band?
GRE Scores at the Top-Ranked Engineering Schools/ The average quantitative GRE scores for top 30 graduate schools of engineering are listed. How to construct the grouped frequency distribution and
Suppose that the average annual salary for worker in the United States is $32,500 and that annual salaries for Americans are normally distributed with standard deviation equal to $6,250. Determine t
Many months later, we reran the turnover assessment on 30 random surveys as well as determined the turnover rate was 1.9 people per 2 weeks. Test as a large sample Z test, at the 1 tail test 0.05 a