The Avon Longitudinal Study of Parents and Children (ALSPAC) included approximately14,000children born between 1991and1992in southwestern England and was intended to investigate a wide range of influences on the health and development of children. The data reported here investigate the relationship between being bullied at age13 which includes incidents such as the taking of personal belongings, being threatened, blackmailed, hit or beat up, being called nasty names or having lies told about them, etc. and depression at18years of age. From the original cohort,3988children had data on both the frequency of being bullied and later depression. The table shows theresults.

	Frequency of BeingBullied
Never	Occasionally	Frequently
Depressed	97	103	101
Notdepressed	1762	1343	582

The JMP output provided gives two degrees of freedom for the data in thetable.

Lucy Bowes et al., "Peer victimisation during adolescence and its impact on depression in early adulthood: Prospective cohort study in the United Kingdom,"British Medical Journal,350 (2015),h2469.

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What is the mean value of the statistic22if the null hypothesis is true? Give you answer as a wholenumber.