Name:__________ warm-up 12-2 HEALTH CLUBS At a heath club, a random sample of members are asked some questions about dieting. Classify the sample as simple,

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Name:__________ warm-up 12-2 HEALTH CLUBS At a heath club, a random sample of members are asked some questions about dieting. Classify the sample as simple, systematic, self- selected, convenience, or stratified. ELECTIONS At a shopping mall, every 10th shopper is asked some questions about the upcoming election. Classify the sample as simple, systematic, self-selected, convenience, or stratified. MUSIC At a rock concert, a random sample of people is asked the type of music they prefer. Is the sample biased or unbiased? Explain your reasoning. GOLF Every fifth person leaving a golf course is asked his of her favorite summertime activity. Is the sample biased or unbiased? Explain your reasoning.

TELEVISION The management of a detention center alters the colors of their walls then compares the behaviors of their kids with the kids where the colors were not changed. Determine whether the situation describes a survey, an observational study, or an experiment. Explain your reasoning.

Details of the Day EQ: How do rational functions model real- world problems and their solutions? How are expressions involving rational expressions? I will be able to… Activities: Warm-up Review homework Notes: Class work/ HW Vocabulary:.. Identify sample statistics and population parameters. statistical inference statistic parameter mean absolute deviation (MAD) standard deviation variance

12-2 Statistics and Parameters Slope

A Quick Review HEALTH CLUBS At a heath club, a random sample of members are asked some questions about dieting. Classify the sample as simple, systematic, self- selected, convenience, or stratified. ELECTIONS At a shopping mall, every 10th shopper is asked some questions about the upcoming election. Classify the sample as simple, systematic, self-selected, convenience, or stratified. MUSIC At a rock concert, a random sample of people is asked the type of music they prefer. Is the sample biased or unbiased? Explain your reasoning. GOLF Every fifth person leaving a golf course is asked his of her favorite summertime activity. Is the sample biased or unbiased? Explain your reasoning.

A Quick Review TELEVISION The management of a detention center alters the colors of their walls then compares the behaviors of their kids with the kids where the colors were not changed. Determine whether the situation describes a survey, an observational study, or an experiment. Explain your reasoning.

Notes and examples A. Identify the sample and the population for each situation. Then describe the sample statistic and the population parameter. A movie rental business selects a random sample of 50 orders in one day. The median number of rentals per order is calculated. B. Identify the sample and the population for each situation. Then describe the sample statistic and the population parameter. A stratified random sample of 2 trees of each species is selected from all trees at a nursery. The mean height of trees in the sample is calculated.

Notes and examples A company’s human resources department surveyed the employees about working conditions. Identify the sample and the population. Then describe the sample statistic and the population parameter.

Notes and examples PETS A rescue agency records the number of pets adopted each month: {14, 18, 12, 17, 15, 20}. Find and interpret the mean absolute deviation. Steps: Find the mean. Find the absolute values of the differences. Find the sum Find the mean absolute deviation

Notes and examples FOOTBALL A statistician reviewed the number of points his high school team gave up at their home games this season: {14, 0, 20, 24, 17, 30}. Find and interpret the mean absolute deviation.

Notes and examples SCORES Leo tracked his homework scores for the past week: {100, 0, 100, 50, 0}. Find and interpret the standard deviation of the data set. Find the mean Find the square of the differences, Find the variance. Find the standard deviation.

Notes and examples FIGURE SKATING The scores that Jenny received from the judges: {6.0, 5.5, 5.5, 6.0, 5.0, 5.5, 5.5, 6.0}. Find and interpret the standard deviation of the data set.

Notes and examples FIGURE SKATING The scores that Jenny received from the judges: {6.0, 5.5, 5.5, 6.0, 5.0, 5.5, 5.5, 6.0}. Find and interpret the standard deviation of the data set.

Notes and examples Use a graphing calculator to find the mean and standard deviation. Clear all lists. Then press STAT ENTER, and enter each data value into L 1. To view the statistics, press STAT 1 ENTER. BOWLING Gerald and Erica compared their bowling scores. Compare the means and standard deviations