1. 13 – 7b Comp Stats Cent Tend & Variability

2.  Therefore, the difference between the mean price of used cars sold at each dealership is 42 - 33 = 9. Divide this difference by the variability. So, the difference between the mean price of used cars sold at each dealership is approximately 6 times the variability.

3.  Therefore, the difference between the median number of hummingbirds spotted per day at each feeder is 28 - 18 = 10. Divide this difference by the variability. Feeder 1 Median = 28 Feeder 2 Median = 18 So, the difference between the median number of hummingbirds spotted per day at each feeder is approximately 3 times the variability.

4. The mode for restaurant location 1 is 20. The mode for restaurant location 2 is 9. 20 - 9 = 11. The dot plots below show the numbers sold of a new menu item at two restaurant locations each day in June. The variability at each restaurant location is 1.76. The difference between the mode number of new menu items sold per day at each location is approximately how many times the variability?

5. The interquartile range is found by calculating the difference between the third quartile and the first quartile. A health researcher conducted a survey and recorded the percentage of body fat of 20 randomly selected men from two different towns. Ten of the men surveyed were from Pythagoria and 10 of the men were from Bernoullia. The following statistical information was calculated from the researcher's findings.

6. Since the median household income for Cartisia is $50,000, at least half of the households in Cartisia have an income of $50,000 or greater. Also, since the median household income in Pascalville is $68,000, at least half of the households in Pascallvile have an income of $68,000 or greater. A survey was conducted on the salaries of 30 randomly selected households in two different cities. Fifteen of the people surveyed resided in Cartisia, while the other 15 resided in Pascalville

7. At a car dealership, the sales records of weekdays and weekends were examined. Ten of the days examined were weekdays and 10 of them were weekend days. The following statistical information was calculated from the number of sales made during weekdays and weekends. Since the mean is the total divided by the number in the sample, the mean is the only statistic which can lead to determining the number of cars sold. Thus, the total is the number in the sample multiplied by the mean.

8.  Mean is best choice to use At a certain company, the sales records of 30 employees were examined. Fifteen of the employees were married and 15 of them were not married. The following statistical information was calculated from the number of sales of each employee chosen.

9. A government agency conducted energy research on two different towns. The agency selected 12 homes from each town and recorded the number of kilowatt-hours used by the homes over a one-year period. The following statistical information was calculated from their findings.

10. The median is the statistic which can help draw conclusions relative to half of the data in the sample. Since the median of the spring sales was $2,325, and the median of the summer sales was $3,100, both medians were greater than $2,300. A survey was conducted on ice cream sales. An ice cream shop was randomly selected, and the sales amounts from 12 summer days and 12 spring days were analyzed. The statistics from the sales of the ice cream shop are shown below.

11. . A basketball team plays half of its games during the day and half at night. Ten scores from day games and ten scores from night games were randomly selected by the team's statistician. The following statistical information was calculated from the final game scores.