| Tag | Value |
|---|---|
| file | Descriptive-statistics_eur-descriptive-408-en_eur-descriptive-408-en |
| name | eur-descriptive-408-en |
| section | Descriptive statistics/Summary Statistics/Measures of Location/Mean, Descriptive statistics/Summary Statistics/Proportion |
| type | num |
| solution | 0.9 |
| tolerance | 0 |
| Type | Data manipulation, Interpreting output |
| Program | SPSS |
| Language | English |
| Level | Statistical Literacy |
A knowledge test on alcohol contains 20 items and is administered to 202 high school students. The variable [total score] gives the total correct scores. Gender (0 = woman; 1 = man) and alcohol use (0 = very often; 1 = often; 2 = sometimes; 3 = never) are also included in the dataset.
The researcher wants to assign the total scores of the students to the following percentile groups: 0-20% = 1; >20%-40% =2; >40%-60%=3; >60%-80%=4; >80% = 5. Compute a new variable indicating the percentile group that each student was assigned to based on their percentile scores. What is the proportion correct score (mean) on item 8 [item8] for the students assigned to percentile group 4? (2 decimals)
Open the dataset below to answer this question:
The proportion correct on item 8 for students assigned to percentile group 4 is 0.90. First a new variable has to be computed using the percentile scores and the recode into different variable function. After, find the mean of group 4 on item8. This mean represents the proportion correct on this item.