1. A group of 200 adults aged 21 to 50 were selected from those entering Fit Right - 88246

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1. A group of 200 adults aged 21 to 50 were selected from those entering Fit Right Health stores in Washington State, and were randomly divided into two groups. One group was given an herb and the other a placebo. After 6 months, the number of respiratory tract infections in each group were compared. I. What is the population? II. What is the sample? III. Is the study observational or experimental? Justify your answer. IV. If observational, identify ALL variables. If experimental, identify ALL independent and dependent variables. V. For each of the variables identified in part IV, list which of the four levels/scales of measurement was used to obtain data on these variables? VI. Classify each of the variables identified in part IV as either attribute or numerical. 2. Classify the following variable as nominal, ordinal, discrete, or continuous and state why it is such a variable: most popular video games 4. Construct a frequency distribution table to organize the following set of data: 141 7. Please show all of your work when answering the following: I. Use Chebyshev’s theorem to find what percent of the values will fall between 220 and 316 for a data set with a mean of 268 and standard deviation of 12. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of 239 and standard deviation of 19. 8. Starting with the data values 70 and 100, add three data values to the sample so that the mean is 85, the median is 76, and the mode is 76. Please show all of your work.
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