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In a nationwide survey of 1000 companies with more than 50 employees, managers were asked to rank various factors that influence their decisions in hiring employees. Each factor was ranked on a scale of 1 to 10, with 1 being not important and 10 being very important. The factor "educational background" received a mean ranking of 7.2.
Is the sample mean of 7.2 exactly the same as the population mean?If another sample of 1000 companies is taken, do you expect the sample mean to be 7.2 again? Why or why not?Repeating this experiment many times with different samples, what values for the sample means would be possible? What values would repeat more often?
The country clerk wants to estimate the protection of retired voters who will need special election facilities. suppose a sample of 400 retired voters was taken. If 150 special election facilities, calculate an 80% confidence for the population pr..
One item on a questionnaire asks, "How many siblings (brothers and sisters) did you have when you were a child?" A researcher computes the mean, the median, and the mode for a set.
For each sample, carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
Given: You are using a significance level of α = 0.05 to test a claim that p > 0.5. Your sample is a simple random sample of size n = 49. Calculate β for the test, assuming that the true population proportion is 0.7 and showing all work.
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
What proportion of 1040R tax forms will be completed in more than 114 minutes? Round your answer to at least four decimal places.
Describe a real-life situation where Pascal's Triangle can be used to calculate probability. Is this the best method for solving your calculation?
Explain why it makes sense for a set of data to have a correlation coefficient of zero when the data show a very definite pattern.
Assume it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $25 and standard deviation $8.
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
The mean weight of trucks traveling on the the highway is unknown. A state highway inspector needs an estimated mean. He selects 49 trucks passing the weighing station and gets a mean of 15.8 tons
For a sample of n 4 weeks in which the daily temperature was extremely hot, the weekly average of hit-by-pitch players was M 15.5. Are players more likely to get hit by pitches during hot weeks?
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