Identify what type of sampling is used.   A market researcher selects 500 people from EACH of 10 cities.  

Identify the type of observational study.   A teacher obtains data about the number of absences and final average over the PAST 3 years.  

Find the probability that z lies between -2.41 and 0.  

A Type II error is made by

A random sample of the houses in a particular city is selected and the level of random gas is measured for each house in the sample.  The values collected are given below in parts per million (ppm).  Experience has shown that random gas level is approximately normally distributed for this population.  4, 8, 13, 6, 7, 3, 9, 8, 11, 8 Find a 95% confidence interval for

Match the example to the employee relations concept.

Which of the following CANNOT be identified from a boxplot.  

Select two (2) true answers about OSHA.

Add or subtract as indicated.9 + 5 – 8 – 8

% Gold by Weight % Lead by Weight 0.22 0.41 0.24 0.31 0.20 0.89 0.23 0.62 0.18 0.41 0.15 0.88 0.17 0.67 0.17 0.59 The data above were gathered on 8 coins known to have been produced by a mint in Rome.  Gold and lead have been identified as possible factors in identifying the coins as having been minted in Rome.  Use   to estimate the proportion of the y value that is determined by the linear relationship with the x value.