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Suppose you want to estimate the average number of sick days taken by all employees at a large company during a year. Suppose (unknown to you) this is four days. You devise a way to randomly select 200 employees for a survey and use the sample mean number of sick days as an estimate of the population mean for all workers at the company. Unknown to you, the sampling distribution of the sample mean has an average value of 4.8. This means that
a. your estimator (the sample mean) is not an unbiased estimator of the population mean because your sampling method tends to pick people that take more sick days.b. your estimator is an unbiased estimator of the population mean.c. if you survey more American adults, your sample mean will tend to get closer to the population mean.d. the person computing it doesn't favor any particular outcome.
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot." What is the standard deviation for the sample proportion?
Determine 95% confidence interval evaluate for average number of years served by all Supreme Court justices?
A permutation resample for a two-sample test
Construct a stem and leaf plot of the income. what do you predict about the shape of the population distribution. complete the following sentence. Fifty percent of the data falls below $ ______.
Area to right of mean of normal probability distribution is?
Draw a simulation experiment for car agency and simulate using fleet of four rental cars for 10 days.
Use Are the data statistically significant at the given level of significance? Based on your answers, will you reject or fail to reject the null hypothesis?
Industry standards suggest that 13 percent of new vehicles require warranty service within the first year. Compute the mean and standard deviation of this probability distribution.
National average for 2-year leases is 30,000 miles. Select the suitable hypothesis.
Determine the average number of people you should ask in order to determine someone with same birtheday as yours.
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least one key formula from this Module that you could us..
A state transportation official claims that the mean waiting time at exit booths from a toll road near the capitol is no more than .40 minutes. for a sample of 35 motorists exiting the toll road, it was found that the mean waiting time was .46 min..
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