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    a. In a similar study using a sample of n = 9 participants, the individuals who wore the shirt produced an average estimate of M= 6.4 with SS = 162. The average number who said they noticed was 3.1. Is the estimate from the participants significantly different from the actual number? Test the null hypothesis that the true mean is ? = 3.1 using a two-tailed test with = .05.

    b. Is the estimate from the participants significantly higher than the actual number (? = 3.1)? Use a one-tailed test with ? = .05.

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    Solution Preview

    a. The null hypothesis is the estimate from the participants the same as the actual number. mu=3.1
    The alternative hypothesis is it is significantly different from the actual number mu> or < 3.1.
    At 0.05 significance level, degree of freedom is 9-1=8, the critical t value is 2.31. The ...

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