# Question

A statistics professor wants to compare today's students with those 25 years ago. All his current students' marks are stored on a computer so that he can easily determine the population mean. However, the marks 25 years ago reside only in his musty files. He does not want to retrieve all the marks and will be satisfied with a 95% confidence interval estimate of the mean mark 25 years ago. If he assumes that the population standard deviation is 12, how large a sample should he take to estimate the mean to within 2 marks?

## Answer to relevant Questions

A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the ...Refer to Exercise 6.102. Suppose the student informs the professor that he can see only one coin and it shows tails. What is the probability that the other coin is also tails?1.1 In your own words, define and give an example of each of the following statistical terms. a. Population b. Sample c. Parameter d. Statistic e. Statistical inference Provide two examples each of nominal, ordinal, and interval data.Create a sample of five numbers whose mean is 6 and whose standard deviation is 0.Post your question

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