10. A ccording to an article in a recently published medical journal, one-third

Question

10. A ccording to an article in a recently published medical journal, one-third of all sets of triplets consist of all females, one-fourth are all male sets, and the remaining sets are of mixed gender. A simple random sample of 78 sets of triplets born in the past 20 years is obtained from hospital records. The results are presented below Gender make-up of triplets 1: All female 2: All male 10 3: Mixed gender 57 Total 78 Under the null hypothesis that the claim made in the medical journal is indeed true at the 5% significance level, do we reject the null hypothesis? 11. The chi-square goodness-of-fit test is for use on data with variables A) quantitative B) categorical C) quantitative or categorical 12. What is the null hypothesis for a chi-square goodness-of-fit test? 13. The P-values for the goodness-of-fit test are computed from which distribution? A) Normal B) Binomial Chi-square Uniform 14. In a two-way table, the observed counts should always be close or equal to the expected counts. A) True B) False

Explanation / Answer

sOLUTION11:

chi sq test is a non parametric test for categorical variables

Assumption of testa re:

random,

large sample size,indpendence conditions to be met

B,categorical

Solution12:

null hypothesis:

the data are consistent with a specified distribution

that is null hypothesis specifies the proportion of observations at each level of categorical variable.

Solution13:

p vallue from chi square distribution

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