| Tag | Value |
|---|---|
| file | Descriptive-statistics_eur-descriptive-414-en_eur-descriptive-414-en |
| name | eur-descriptive-414-en |
| section | Descriptive statistics/Score interpretation/z-score |
| type | num |
| solution | 0.19 |
| tolerance | 0 |
| Type | Data manipulation, Interpreting output, Calculation |
| Program | SPSS |
| Language | English |
| Level | Statistical Literacy |
A researcher working at the psychology institute investigates alcohol abuse among adolescents. The researcher designed 34 statements the adolescents can agree or disagree with on a four-point scale (1. completely agree; 2. somewhat agree; 3. somewhat disagree; 4. completely disagree). An example of a statement is: When I feel lonely, I enjoy drinking an alcoholic beverage. The answers of 312 girls (0) and boys (1) to the 34 statements are in the dataset. Also included in the dataset are IQ scores, scale scores and the amount of alcohol use (1 = very often; 2 = often; 3 = sometimes; 4 = never).
What is the probability of a scale score of 24 or lower under the assumption that the scores come from a normally distributed population? (2 decimals)
Open the dataset below to answer this question:
The probability of a scale score of 24 or lower is 0.19 when we assume normality (use the cdf.normal function to calculate the p-values and then look up the p-value associated with a score of 24).