Question 10

$The lengths of individual sheilfish in a population of 10,000 shellfish are approximately nonn\*lly sü.fiihuted with mean 10 centimeters and standard deviation 0.2 centimeter. Which of the following is the shortest interval that contains approximately 4,000 shellfish lengths? (A) O cm to 9.949 cm (B) 9.744 cm to 10 cm (C) 9.744 cm to 10.256 cm (D) 9.895 cm to 10.105 c (E) 9.9280cmto 10.080 cm q / b0D& HDL 3$

Question 15

Question 16

$Jason wants to determine how age and gender are rel\&d to political party preference in his town. Voter regis- tration lists are stratified by gender and age-group. Jason selects a simple random sample of 50 men from the 20 to 29 age-group and records their age, and pany registration (Democratic, Republican, neittrr). He also selects an simple random sample of women fmm the 40 to 49 age-group and the sanE Of the following, wtüch is the most important observation about Jason' s plan? (A) plan is well conceived and should serve the intended purpose. (B) His samples are too small. (C) He should have used equal sample sizes. should have randomly selected the two age groups instead of choosing them nonrandomly. ) will be unable to tell wlwttrr a difference in party affiliation is related to differences in age to the difference in gender. VO..QvvU-LD$

Question 17

Residuals = observed/actual y - predicted y
See Chi-square test statistic formula

Question 18

Question 19

$に山冨第ー、 0 に 1 \! ′ ・に当の 1 に 10 一ま - 19 L 菱】山あゝラ・ 8 ー - ト$

Question 23

Question 24

Question 34

Question 35

$In a test of the Ho: g = 100 versus Ha: \> 100, the power of UE test when = 101 would be greatest for which of the following choices of sample size n and significance level ? (B) n = 10, a = 001 (C) n = 20, a = 005 as n f) lcss vamiaUL8 (E) It cannot be determined from the infcrmation given.$

Question 37

$A simple random sample produces a sample mean, i, of 15. A 95 percent confidence interval for the corresp«ding population mean is 15 ± 3. Which of the following statements must be true? (A) Ninety-fivepercentofthepop onmeasurements fall between 12and 18. (B) Ninety-five percent of the sam measure11Ents fall between 12 and 18. (C) If 100 samples were taken, 9 of bk\&n 12 and 18. (D) P(12 18) = is (E) f g = 19. this of 15 would be unlikely to occur. If tee -fl. c x,) \* s so X = IS is$

Question 40

$A student working on a history IYOject decided to find a 95 percent confidence interval for difference in mean age at the of to omce American Presidents versus former British Plin-z Ministers. TIE student found the ages at dle tillE of election to office fcx the members of tx\*h groups, which included all of the Anrrican Presidents and all of the British Ministers, arxi used a calculator to fuxi tbe 95 percent confi\&nce interval based on the t-distribution. This procedure is not appropriate in this context becåuse the sample sizes for the two groups are not equal (B) entic was nrasured in both cases, so actual difference in means can be computed and a cohhdence interval should not be used fo (C) elections to office take place at different intervals in two countries, so the distribution of ages cann« be same (D) ages at the time of election to omce are likely to be skewed rather than bell-shapd, so the assumptions for using this confidence interval formula are not valid (E) ages at the time of election to office are to have a few large outliers, so the assumptions for using this confidence interval formula are not valid$

2002 Multiple Choice