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May 23, 2018 bias someone use someone wording bias free May 24, 2018

May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

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Page 1: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

bias

someone   usesomeone  

wordingbias free

May 24, 2018

Page 2: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

sampling   method

notvariety

Page 3: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

lack

Page 4: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

alter

Page 5: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

survey

Page 6: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

http://www.raidersonline.org/lyle-alzado.php

Make the survey anonymous.

Response Bias.

Respondents are unlikely to answer truthfully.

*Random drug testing

is common in sports.

Page 7: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

Measurement Bias

Survey question limits options.

Allow the question to be open

Page 8: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

Sampling Bias

Golfers will likely be opposed.

Survey the community at large.

Page 9: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

Non-Response Bias

70% don't answer

Offer an incentive to complete the survey.

Page 10: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

Measurement Bias

Use hidden unmarked cars.

People drive slower when they see a police car

Page 11: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

- needs a variety of teenagers (in much larger numbers) that would accurately represent ALL teens.

- Friends -> Sampling bias

similar views

Page 12: May 24, 2018...S) RLonb 01 IOOÇPSII blsÀGLe satŒq GAGIJ p!sasq suq bL0A!qsq s eolnuou. escu 01 dnseuoue' 01 Loni. acgcna. ph - blghsq guq cgqqs acgcna ga g qsusua!As l!uswgu gleo

May 23, 2018

Practice: Handout