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1) In a recent survey of 150 households, 54 had central air conditioning. Find a 96% confidence interval for the true percentage of all households that have central air conditioning. Write a sentence that interprets this interval.
2) A researcher wishes to estimate, with 95% confidence, the proportion of people who own a home computer. A previous study shows that 40% of those interviewed had a computer at home. Find the minimum sample size necessary if the researcher wants to be accurate within 2% of the true proportion.
It is known that 60 percent of all registered voters in the 42nd congressional District are Republicans. There registered voters are selected at random from the district. Compute the probability that exactly 2 of the 3 selected are Republicans, u..
To determine monthly rental prices of apartment units in San Francisco Bay area, samples were constructed in the following ways. Identify the technique used to produce each sample.
Find out the probability that the return for common stocks will be more than 0%.
If we select a crew member at random, what is the probability the crew member earns:
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
Find the probability that in a given month:
Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as?
One person's file is chosen at random. Find out probability that selected person will fall into following categories. Book keeping.
Place the steps below in the correct order for the construction of a control chart.
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
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