STT 231 ACTUAL EXAM 1 QUESTIONS AND CORRECT ANSWERS LATEST UPDATE 2026/2027 GRADED A+ .

1. You asked ten of your classmates about their weight. On the basis of this information, you stated that the average weight of all students in your uni-versity or college is 142.6 pounds. Thisis an example of::statistic 2. A company has developed a new battery, but the average lifetime is un-known. In order to estimate this average, a sample of 100 batteries is tested and the average lifetime of this sample is found to be 250 hours. Identify population,sample, variable, parameter, and statistic.: -Population:allnewbatteries -Sample: 100 tested batteries -Variable: battery lifetime -Parameter: average of all tested batteries -Statistic: average of 250 hours 3. A recent Wall Street Journal poll asked a group of American voters to rate economic conditions in the United States. 22% of the respondents rated economic conditions as "favorable." Identify the population, sample, sample statistic, and population parameter in thissurvey.: -Population:eligiblevoters -Sample: chosen voters -Statistic: 22% favorability of sample -Parameter: Percentage of all voters who would consider the economy favorable 4. Quantitative data: Naturally numbers, averages, height, weight, age, GPA, credit hours, etc. 5. Qualitative data: Not naturally numbered data, major, etc. 6. A recent study examined the intended travel destinations for a sample of residents from Grand Rapids, Michigan. The respondents indicated the likely destination oftheir next vacation.What are the units and variables CORRECT ANSWER -Units:people who responded -Variables: intended travel destination 7. For a classthe average score was 70, the median 63 and standard deviation 13. The instructor decided to add 5 points to all the scores. How will the mean, median, and standard deviation change CORRECT ANSWER -Mean and median will increase by 5 and standard deviation will not change. 8. When will the mean equal the median CORRECT ANSWER Symmetrical distribution 9. When will the mean be less than the median CORRECT ANSWER Skewed left (negatively skewed) 10. When will the mean be greater th