******** ***** Over the past five years the mean age at death in the United States has been 72.5 years. In a random sample of the biographies of 25 "famous persons" who died in this period, the mean age at death was 73.5 years with the sample standard deviation of s=2.8 years. Test the hypothesis that famous people o The average live longer than the rest of a us? (a =.05)¶

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The mean score for first exam in your first organic chemistry class (section A) was 60, with a standard deviation of 5. Your score on the exam was 70. A. How many standard deviations above the mean is your score?

Question 4

z Scores LeBron James, one of the most successful basketball players of all time, has a height of 6 feet 8 inches, or 203 cm. Based on statistics from Data Set 1 “Body Data” in Appendix B, his height converts to the z score of 4.07. How many standard deviations is his height above the mean?

Forty refrigerators from two different models of a refrigerator manufacturer are compared to see if the smaller model uses less energy than the larger model. The energy was measured in kilowatt hours per month (kwh/mo). From years of testing these models, it is known that the standard deviation of kwh/mo is 34 kwh/mo for the smaller model and 40 kwh/mo for the larger one. From this survey, the sample means and standard deviations are 125 and 34, and 90 and 40, respectively. If we conduct a hypothesis test, the decision and conclusion are   Group of answer choices   Do not reject the null hypothesis and conclude that the average kwh/mo are the same.   Reject the null hypothesis and conclude that the average kwh/mo are different.   Reject the null hypothesis and conclude that the average kwh/mo for the smaller refrigerator is higher than for the larger model.   Do not reject the null hypothesis and conclude that the average kwh/mo for the smaller refrigerator is higher than for…

QUESTION 12 You hypothesize that drinking water increases test scores so you design a study comparing test scores between people who drink water and people who do not drink water.You collect data on 62 people and find that in your sample there are 27 people who do not drink water and 35 people who drink water. The mean test score for non-water drinkers is 62 with a standard deviation of 13, while the mean score for those who drink water is 75 with 11 standard deviation. Above you have calculate the t-statistic and found the critical value of t. Based on this information, is the difference between your two means STATISTICALLY SIGNIFICANT? OYes, because the t-statistic value calculated was less than the critical value of t, indicting that p .05 O Yes, because the t-statistic value calculated was larger than the critical value of t, indicating that p .05