10:18 Back Exam 1 - Practice.docx Name 1. A researcher published this survey result: "74% of people would be willing to spend 10 percent more for energy from a non- polluting source". The survey question was announced on a national radio show and 1,200 listeners responded by calling in. 1. Is this a valid survey, or is there potential bias? 2. If there is potential bias, what is the source? 2. A manufacturer of laptop computers claims that only 1% of their computers are defective. In a sample of 600 computers, it was found that 3% were defective. If the proportion of defectives were really only 1%, there would be less than 1 chance in 1000 of getting such a large proportion of defective laptops in the sample. Is there statistically significant evidence against the manufacturer's claim? Why or why not? Does the result have practical significance? Statistical significance: Practical significance: 3. The table shows the weights (in pounds) and monthly incomes (in dollars) of nine randomly selected women between the ages of 18 and 65. Assume that the x-values are the weights and the y-values are the monthly incomes. Weight (1b) 113 132 155 122 166 140 118 129 185 Monthly Income (dollars)| 1420 | 3650 | 5475 | 2310 | 4710 | 2910 | 1720 |2460 | 4115 a) Are the x-values matched with the b) If the x- and y-values are matched, does it make corresponding y-values? That is, is each x- sense to use the difference between each x- value associated with the corresponding y- value and the y-value that is in the same value in some meaningful way? column? Why or why not? 5. Develop an alternate conclusion: In a study of headache patients, every one of the study subjects with a headache was found to be improved after taking a week off of work. Conclusion: Taking time off work cures headaches. gardener has 75 clients, 45% of whom are 7. On a test, if 80 questions are answered and 59 of businesses. Ford the number of business them are correct, what is the percent of correct clients answers? Round to the nearest percent. A bus company claims that in the past year it After inspecting all of 55,000 kg of meat stored at has-duced the number of late departures of he Wurst Sausage Company, it was found that buses by 100%. What is wrong with this sooo kg of the meat was spoiled. Is the value statement? 55,060 a sample or a parameter? 10. A health and fitness club surveys 40 randomly 11. Is the value s statistic or a parameter? Is it selected members and found that the average discrete or continuous? The number of weight of those questioned is 157 16. Is the freshmen entering college in a certain year is value 157 a statistic or a parameter? 621. 12. The total number of phone calls a sales 13. The temperature of a cup of coffee is 67.3.F. representative makes in a month is 425. Is the Is the value 67.3 a statistic or a parameter? Is value 425 a statistic or a parameter? Is it it discrete or continuous? discrete or continuous? DOO 5 000 0= Dashboard Calendar To Do Notifications Inbox