Test 90    (statistic)
1. The following are true about confidence intervals:
a. the intervals are larger with smaller sample size

b. they indicate the presence or otherwise of a statistical 
    difference between two groups

c. a 95% confidence interval means that 95% of all 
    observed values fall within that interval.

d. in an odds ratio, if the 95% confidence interval includes 
    unity then no significant difference may apply.

e. the intervals give a range of values within which the true 
    value will lie.

2. True statements about non-parametric tests include:

a. they can be sued on small samples

b. they can be used to analyse samples that are normally 

c. Student's paired t-test is a non-parametric test

d. they can be applied to ordinal data

e. they can not be used if the nature of the distribution of 
    the data is unknown.

3. In statistics:

a. null hypothesis describes the probability that a 
    relationship exists between two samples. 

b. analytical statistics are the same as inferential statistics. 

c. descriptive statistics produce mean, median and mode
    from data.

d. the mode is the measurement which lies exactly 
    between each end of a range of values ranked in order.

e. skewed data invalidates further statistical analysis.

4. Correlation coefficient:

a. is denoted by the symbol "r" 

b. is measured on a scale of 0 to 1.

c. a positive value implies that a rise in one variable 
    accompanies a rise in the other.

d. describes the degree of association between two 

e. describes the degree of agreement between two 

5. Non-parametric tests include


b. Student's t-test

c. Chi-squared test

d. Wilcoxon signed rank test

e. Mann-Whitney U test.

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