Basic Statistics

'Gender' is type of which variable?

• Categorical, ordinal
• Numerical, continuous
• Numerical, nominal
• Categorical, nominal

The null hypothesis can be described as

• The same as the research hypothesis
• The different groups are significantly different
• A statement of the expected results
• A statement that there is no difference or association

Which one of these statements reflects a null hypothesis?

• Older adults have worse memories than younger adults

• Caffeine consumption is not associated with exam performance

• Men will score higher than women on spatial awareness

• As temperature increases so too will the level of aggression

Regarding Interval Estimation, which of the following statements is FALSE?

• The confidence level is also known as 1- α .

• The Confidence Interval is not affected by study sample size.

• Width of CI is affected by the confidence level, α.

• The typical Confidence Interval is 95% CI

_________ statistics are used to infer the sample analysis as the true population parameter.

• Descriptive
• Regression
• Inferential
• Correlation

Which of the following is a type of parametric statistical test?

• Pearson correlation

• Kruskal-Wallis test

• Spearman correlation

• Wilcoxon signed rank test

Which of the following is NOT useful for determining the normality of data distribution?

• Comparing mean, mode and median.

• Kolmogorov-Smirnov statistics test.

• Levene's test of homoscedasticity.

• Checking skewness and kurtosis values.

A t-test is used to compare

• Two means

• Three means

• Two proportions

• None of the above

The two forms of t-tests are

• One-way and two-way Factorial and interaction

• Independent and dependent

• Bivariate and multivariable tests

• Wilcoxon sum and signed rank tests

Assumptions for ANOVA analysis are as the following, EXCEPT:

• Independent and random samples.

• Sample populations are normally distributed.

• Populations have equal variances.

• Data is related and not mutually exclusive.