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Market research analyst suspects that average monthly household expenditure for long distance telephone service in City A exceeds average monthly household expenditure for long distance telephone service in City B by more than $20. Market research analyst thinks that monthly household expenditures for long distance telephone service are normally distributed both in City A and City B, and that two population variances are equal. Market research analyst took random sample of 12 City A households and random sample of 15 City B households and recorded following information regarding their monthly expenditures for long distance telephone service.
City A Mean = 843City B Mean = 54City A Std. Dev. = 18City B Std. Dev. = 12City A Sample Size = 12City B Sample Size = 15
If 99% confidence interval for mean difference between average monthly household expenditure for long distance telephone service in City A and average monthly expenditure in City B extends from X to Y, determine the value of X?
Proponents and critics of this legislation have looked at the number of traffic fatalities on major U.S. highways (e.g., I-90, I-65, I-75) for the years preceding and following this legislation. Sonny examined the traffic fatalities on each of the..
In a perfectly symmmetrical distribution: a) the range equals the interquartile range b) the interquartile range equals the mean c) the median equals the mean d) the variance equals the standard deviation
The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.
The main part of the ACS contacts 250,000 addresses by mail each month, with follow-up by phone and in person if there is no response. Each household answers questions about their housing, economic, and social status. What is the Population.
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
Determine a simple algebraic relationship between the negative binomial probability P(x) and the binomial probability for the probability of n successes in x trials.
Explain an organizational scenario where quantitative (ratio level of measurement) information is or could be used to make management decisions about creating, maintaining, or improving quality.
At the 5% level of significance test whether the bottling process is carried out accurately or whether the filling machinery needs calibration. Use both the critical and the p-value approaches.
How many individuals will it need to sample to achieve this level of accuracy and confidence?
A check of dorm rooms on a large college campuses revealed that 38% had refrigerators, 52 percent had TVs and 21 percent had both a TV and a refrigerator. What's the probability that a randomly selected dorm room has.
Determine probability that number of boats constructed next month will be between 4 and 7 (both inclusive).
What is an independent sample and what is a related sample? When should researchers use varying hypothesis tests for the different types of samples?
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