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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.
The standard deviation is thought to be $400. How many card holders should be sampled? Your company charges a set dollar amount for each account in the sample.
If the random sample of 16 men does result in a mean score of 590 is there strong evidence to support the claim that the course is actually effective? why or why not?
Assume that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
In a recent year, 10% of all luxury cars sold were black. If 25cars of that year and type are randomly selected, find the following probabilities.(a) At least five cars are black.
Using bar charts to compare observed frequencies between variables can be problematic when?
A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthf..
Standard deviation of sample was $3.53. Determine point estimate of population mean. Determine the 95% confidence interval of population mean. Suppose the variable is normally distributed.
What is the relationship between a confidence interval and a single sample, two-tailed hypothesis test? How are they the same? How are they different?
Assume sps professors have the average life normally distributed of 82 years, with population standard deviation of 5 years. Determine percent of sps professors will not live more than 80 years?
Suppose the population is normally distributed they make a decision to do a hypothesis test.
Today, around the world, Churchill"s name is revered. There are Winston Churchill Societies in most countries. Adolf Hitler and Nazi Germany. Which of these men is a hero? Winston Churchill or Neville Chamberlain?
Stats Questions Set. Which of the following statements correctly compares the t -statistic to the z -score when creating a confidence interval?
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