A psychologist is investigating the hypothesis that children who grow up as the only child in the household develop different personality characteristics than those who grow up in larger families. A sample of n = 30 only children is obtained and each child is given a standardized personality test. For the general population, scores on the test form a normal distribution with a mean of μ = 50 and a standard deviation of σ = 15. If the mean for the sample is M = 58, can the researcher conclude that there is a significant difference in personality between only children and the rest of the population? Use a two-tailed test with α = .05.
A psychologist is investigating the hypothesis that children who grow up as the only child in the household develop different personality characteristics than those who grow up in larger families. A sample of n = 30 only children is obtained and each child is given a standardized personality test. For the general population, scores on the test form a
The claim of the test is that whether there is a significant difference in personality between only children and the rest of the population or not. The hypothesis is,
Null hypothesis:
Alternative hypothesis:
The test statistic is,
The test statistic is 2.9212.
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