Across 1. Best methods for probability problems 12. A JPG or a GIF, e.g. 15. Raleigh-Durham airpt. 16. Non-written exam 17. It’s std. 19. Yes, to Yuri 20. Yes, en español 21. Part of SRS 23. Pros follower (non-poetic) 25. Diplomat Thant 26. Statistical legacy of the Guinness brewery 30. Choo-choo action 31. Jumbled “amount” 32. Nipper’s co. since 1929 33. Citrus extract for Matthau’s costar? 35. XL + X 36. Wood’s nemesis 37. Financial expert Suze 38. (Obs. – exp.)/s.e. for mean 39. “This I be___” 42. X/X 43. Sample s.d. 44. Youngstown (OH) inst. 45. Histogram x-axis divsion 46. Too 48. Dash of this size: — 50. Pseudonym in 26 Across 54. Final name in Gilligan theme without apostrophe 55. Iniquity spot 57. High-fiber food 58. It should be on the Close if at all possible 60. Triangle congruence thm. (alt.) 62. Adressee designator 64. Joe’s position in WWII 65. Divided 68. 83 69. Skin cream ingredient 71. Essential part of any credible survey

75. Meaning of Latin root found in “iteration” 76. LSRL (a + bx) parameter estimated by a 77. Profitable corp. conglomerate 79. Fought off 81. It could fit between stool and toed Down 1. Assumption in most of our inferential statistics methods (abbr.) 2. What a time waster might say 3. Population mean 4. Operation for which probability calculations can be straight addition (if mutually excl.) 5. Clark’s girlfriend 6. Possible consequence of broken car A/C 7. Dandelion’s deep descender 8. Fighting ___ at Mr. Hansen’s grad school 9. No. of roots for a nonzero constant function 10. Byron Dorgan’s st. 11. XL losers 12. Probability of success 13. E-thieves’ target 14. Not implied by 24 Down 18. Caesar’s lucky number? 21. Population standard deviations 22. Enthusiastically bubbly 24. r (linear) or R (nonlinear) 27. Basically meaningless variable (placeholder) 28. Er (alt.) 29. Leader in enlisted ranks (abbr.) 30. Like an interval that includes its endpoints 34. Weight 40. Hotel 41. Tidewater commonwealth, briefly 45. Follow-up to a smart bomb attack (abbr.) 47. Cone for sale? 49. E-mail, for one 51. Tgt. of annual subcutaneous screening test 52. Ancestral or original (Ger. prefix) 53. Square root of “ciao”? 56. What preschoolers do after play- play 59. Newfangled citrus 61. Rural town in Loudoun County 63. f (x), if x is a root of f 66. Unpronounceable anagram of animal in 67 Down 67. MGM’s Leo, e.g. 68. Bare 69. Jai-___ 70. Waffle brand 71. Catfight sound 72. Automotive engineers’ letters 73. Brit. equiv. to a U.S. congressperson 74. PHP Hypertext Processor (abbr.) 78. Shorter than 48 Across 80. C/II 82. Suitable for all audiences 83. 2.718281828459 . . .