Chapter 7

Sample sizeExtroversionNeuroticism

Sun signnxs.d xs.d

Water signs7812.804.6313.575.25

Other signs19913.675.1813.435.34

Winter signs8212.585.4312.975.22

Summer signs5315.784.8415.455.03

a.Is there sufficient evidence to indicate that those born under water signs have a lower mean extroversion score than those under other (nonwater) signs? Use a level .01 test.

b.Do the data strongly suggest that those born under winter sighs have a lower mean extraversion score than those born under summer sign? Use a level of .05 test?

c.Do the data indicate that those born under water signs differ significantly from those born under other signs with respect to mean neuroticism score? Use a =.05

15. A celebrity`s endorsement of product is a common advertising technique. A group of 298 viewers shown anad containing Aga Muhlach endorsing a product and a second group of 247 was shown the same ad but using an unknown actor. Each participant rated the commercial`s believability on a scale 1 (not believable). Results were follows:

Believable of Ad

Type of AdMeanStd.Den.

Popular Celebrity3.871.25248

Unknown Celebrity3.501.03247

Is there sufficient evidence to indicate that the use of a popular celebrity`s endorsement results in a

true mean believability rating different from the true mean rating for unknown celebrity`s

endorsement? .05 level of significance in testing a hypothesis.