Exam 3: Descriptive Statistics

In the Frequencies dialog box, the Statistics button allows you to: I.select which percentiles you want calculated, including quartiles. II.select which percentiles you want calculated except quartiles. III.select which measures of central tendency you want calculated. IV.select which measures of dispersion (spread) you want calculated.

Which of the following is/are an assumption(s) for calculating a standard deviation? I.Requires interval or ratio data. II.Requires ordinal, interval, or ratio data. III.Requires a perfectly normal distribution of the data. IV.Requires an approximately normal distribution of the data. V.Requires highly skewed data.

The click sequence to get to the Frequencies command is:

Contingency tables (crosstabs) allow you to compare:

In the output, valid percent and cumulative percentage are calculated using:

Z-scores are based on:

Which variable would it be appropriate to calculate a numerical measure of central tendency (e.g., mean, median)?

Which of the following is/are an assumption(s) for calculating a median? I.Requires interval or ratio data. II.Requires ordinal, interval, or ratio data. III.Requires a perfectly normal distribution of the data. IV.Requires an approximately normal distribution of the data. V.Requires highly skewed data.

It would be appropriate to find the percentiles for which of the following variables?

Under the Frequency command in SPSS, if you wanted to find the 11th and 88th percentiles of a set of GRE scores, you would:

The SPSS command sequence for creating a contingency table is:

Calculating z-scores in SPSS requires:

Which of the following is/are true about reporting descriptive statistics? (select all that apply)

Which of the following is/are an assumption(s) for calculating a mean? I.Requires interval or ratio data. II.Requires ordinal, interval, or ratio data. III.Requires a perfectly normal distribution of the data. IV.Requires an approximately normal distribution of the data. V.Requires highly skewed data.

Which of the following is/are INCORRECT about finding descriptive statistics for a subset(s) of your data?

Percentiles are appropriate for which kinds of data (select all that apply):

In the Frequencies dialog box, after selecting your variable you should: