Question

13. In which of the following cases would an independent two sample t test be inappropriate? a. Comparing weight loss in excitable and calm people on a similar diet. b. Comparing IQ of men and women. -c. Comparing changes of attitudes of students from their Freshmen to their Senior year. d. Comparing vitamin C retained in broccoli when cooked by steaming or boiling. 14. Null and alternative hypotheses are statements about - a population parameters c. sample statistics b. sample parameters d. it depends on the question asked 15. A result is called "statistically significant" whenever a. The null hypothesis is true. b. The alternative hypothesis is true. c. The p-value is less or equal to the significance level. d. The p-value is larger than the significance level. 16. The 99.7% confidence interval for the mean length of frog jumps is (12.64 cm, 14.44 cm). Which of the following statements is a correct interpretation of 99.7% confidence. a. When all frogs are considered, 99.7% can jump between 12.64 cm and 14.44 cm. b. There's a 99.7% chance that the mean length of frog jumps falls between 12.64 cm and 14.44 cm. - c. If we were to repeat this sampling many times, 99.7% of the confidence intervals we could construct would contain the true population mean. d. There's a 99.7% chance that any particular frog I catch can jump between 12.64 cm and 14.44 cm. For the next two questions: It is known that for right-handed people, the dominant (right) hand tends to be stronger. For left-handed people who live in a world designed for right-handed people, the same may not be true. To test this, muscle strength was measured on the right and left hands of a random sample of 15 left-handed men and the difference (left-right) was found. The alternative hypothesis is two-tailed. The resulting t-statistic was 1.80. 17. This is an example of: a. A two-sample t-test. b. A paired t-test. c. A pooled t-test. d. An unpooled t-test.

Answer 1

13)  
option c)  
because in this subjects are dependents  
  
  
14)  
option A)  
  
15)  
option C)  
  
16)  
option c)  
  
17)  
a paired t test  
because subjects are same in both cases