Tag | Value |
---|---|
file | Inferential_Statistics_uva-confidence-level-883-en_uva-confidence-level-883-en |
name | uva-confidence-level-883-en |
section | Inferential Statistics/Confidence Intervals/Confidence level |
type | schoice |
solution | TRUE, FALSE, FALSE |
Type | Conceptual |
Language | English |
Level | Statistical Literacy |
IRT-Difficulty | 4.239 |
p-value | 0.0774 |
In a study of the length of time it takes to make a decision about purchasing a home based on photo opportunities, researchers assigned 30 people randomly assigned to one of two conditions: (1) 20 photos of the house were shown and (2) 5 photos of the house were shown. The mean of group (1) was 120 minutes and standard deviation 20; the mean of group (2) was 250 minutes and standard deviation 25. The researchers assume that the standard deviations in the population are are equal and thus arrive at a standard error of 8,266 and 28 degrees of freedom. A 95% confidence interval for the difference 1 - 2 is