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1. A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax. The station calculated a 95% confidence interval and declared "Between 77.9% and 83.4% of residents oppose the new tax."
A. This is a valid interval, so the station must be right.B. We can't say for certain that between 77.9% and 83.4% of residents oppose the new tax because it is a 95% confidence interval.C. Because of the way the poll was conducted, the results are invalid.
2. I want to construct a 92% confidence interval. The correct z* to use is
A. 1.75.B. 1.41.C. 1.645.
3. Several years ago, some researchers at my university asked me to recheck the statistics on a paper they were writing about the impacts of a group of new science courses. They had performed 63 statistical tests on their data at = 5%, and had found 4 "significant" results. They were excited. Should they have been?
A. Yes - this could be important.B. Maybe - depends on the actual results.C. No - too many tests were done.
Mean, Median and Mode and advise her on the best price range for her bouquets and Range and Standard Deviation.
You're in charge of an experiment to evaluate a treatment which is advertised as being 90% effective at killing a particular insect. You plan an experiment in which the treatment is tested on 200 insects.
The types kinds of statistical information collected in your professional setting. Provide examples to illustrate the information/data.
Determine and record how much of the math grade can be explained by the PE grade? How much of the Writing grade can be explained by the Reading grade?
Develop a multiple regression model in which your dependent variable is explained by several independent variables.
What is the mean of the sampling distribution? What is the standard deviation of the sampling distribution? What is the probability that the mean tuition and fees of the sample is greater than $20,000?
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
The sat scores attainted by the students in nyc are approximately normally distributed with a mean of 500 and a standard deviation of 80. Find the percentage of students who score less than 700.
The manufacturer of a new line of ink jet printers would like to include as part of their advertising the number of pages a user can expect from a print cartridge.
he length of time a person spends waiting in a physician's office for an appointment can be a frustrating experience. The results below are the responses of internists from two multispecialty group practices to the following question:
Discuss how scale impacts the interpretation of a graph and name the lowest number of a statistically significant sample size and state the statistically appropriate percentage total of displays
A rental agent claims that the mean monthly rent,u, for apartments on the east side of town is less than$725 . A random sample of 13 monthly rents for apartments on the east side has a mean of$714
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