Hypotheses and statistical tests

There is a difference between the life satisfaction scores (on a self reported scale of 1-10) of those people with over 1000 Instagram followers and those people with less than 50 followers.

• directional; requires a one-tailed test

• non-directional; requires a two tailed test

Males are faster (in minutes and seconds) at solving 10 mental arithmetic problems than females.

• Directional; one tailed

• Non-directional; two tailed

People with low self esteem (under 5 on a self esteem questionnaire, ranging 0-20) are more likely to verbally criticise an out-group member who loses a task than people with high self-esteem (over 15 on the self esteem questionnaire).

• Directional (one tailed)

• Non-directional (two tailed)

There is a correlation between body-image satisfaction (self reported scale of 1-7) and number of Instagram followers for British school girls aged 12-14.

• directional (one tailed)

• non-directional (two tailed)

There is a positive correlation between the amount of cortisol detected in a saliva swab and the number of hours spent in day care in toddlers aged 12 months to three years.

• directional (one tailed)

• non-directional (two tailed)

The larger the hippocampus (number of pixels on an MRI brain scan) the less mistakes made on a spatial memory task.

• directional (one tailed)

• non-directional (two tailed)

Participants observed to help an elderly confederate to cross the road are more likely to also give a donation to a homeless person also played by a confederate.

• directional (one tailed)

• non-directional (two tailed)

People get higher scores on a computer game (showing faster reaction times) after watching a three minute violent movie clip than before watching the movie clip.

• Directional (one tailed)

• Non-Directional (two tailed)

There is a significant difference in the level of empathic concern of people who have resist orders to harm a stranger compared with those who obey such orders

• directional (one tailed)

• non-directional (two-tailed)

When confronted with a spider, there is a correlation between heart rate (beats per minute) and number of sessions of systematic desensitisation attended for people with arachnophobia.

• Directional (one tailed)

• Non-directional (two tailed)