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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.
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be:
Suppose that among all participants, the mean test score is 70.07 and the standard deviation is 10.27. Use z-scores to interpret a raw score of 80. What is the corresponding z-score? How would you interpret this result? Show your work.
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality? Explain.
describe data and objectives - starting with descriptive statistics reader has no idea what this is all about histogram
At the .10 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff? What is the p-value?
In what areas of your business is it important to draw inference? Describe a time when drawing an inference may have hurt your business.
Given below is the rate of return for one year (reported in percent) for the sample of 12 mutual funds. Using .05 significance level is it sensible to conclude that mean rate of return is more than 4.50 percent?
The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be between $7000 and $7500?
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
the national mean annual salary for a school administrator is 90000 a year. a school official took a sample of 25
There are 4000 mangoes in a shipment. It is found that it a mean weight of 15 ounces with a standard deviation of 2 ounces.
you have received a year end bonus of 5000. you decide to invest the money in the stock market and have narrowed your
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