Table:
0
A
B
C
D
E
1
Poll Source
Dates administered
Democrat: Mary Landrieu
Republican: John Kennedy
Lead Margin
2
Rasmussen Reports
October 21, 2008
53%
43%
10
3
Rasmussen Reports
September 25, 2008
54%
41%
13
4
Rasmussen Reports
August 17, 2008
56%
39%
17
5
Rasmussen Reports
July 9, 2008
51%
45%
6
6
Southern Media/ Opinion Research
June 26-June 28, 2008
45.8%
40.3%
5.5
7
Rasmussen Reports
May 28, 2008
47%
44%
3
8
Mellman Group *
May 17-May 20, 2008
49%
33%
16
9
Southern Media/ Opinion Research
March 26-April 9, 2008
50%
38%
12
10
Survey USA
December 6-December 10, 2007
46%
42%
4
11
Zogby International [ dead link ]
November 29, 2007
38%
45%
7

Questions and formulas:
Question: On what date was the poll showing John Kennedy with 45% and Mary Landrieu with 38%?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="45%")*(C1="38%")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,(D2:D11="45%")*(C2:C11="38%")),2))
Level: medium
Question: What was the date of the poll from Survey USA that showed a lead margin smaller than 5.5?
Formula: LET(query1,LET(query1,FILTER(A1:E1,A1="survey usa"),SUMMARIZE(CHOOSECOLS(query1,2),SUMX(CHOOSECOLS(query1,5)))),FILTER(query1,CHOOSECOLS(query1,2)<5.5))
Formula2: LET(query1,LET(query1,FILTER(A2:E11,A2:A11="survey usa"),SUMMARIZE(CHOOSECOLS(query1,2),SUMX(CHOOSECOLS(query1,5)))),FILTER(query1,CHOOSECOLS(query1,2)<5.5))
Level: hard
Question: Which organization administered the poll that showed a lead margin of 5.5?
Formula: LET(query1,SUMMARIZE(A1,SUMX(E1)),FILTER(query1,CHOOSECOLS(query1,2)=5.5))
Formula2: LET(query1,SUMMARIZE(A2:A11,SUMX(E2:E11)),FILTER(query1,CHOOSECOLS(query1,2)=5.5))
Level: hard
Question: Which poll shows Democrat Mary Landrieu with 53% against Republican John Kennedy?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="53%"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,C2:C11="53%"),4))
Level: medium