12. Catching a Cold Is your chance of getting a cold influenced by the number of social contacts you have?

One study seems to show that the more social relationships you have, the less susceptible you are to colds.20 A group of 276 healthy men and women were grouped according to their number of relationships (such as parent, friend, church member, neighbor). They were then exposed to a virus that causes colds. An adaptation of the results is shown in the table.

a. Do the data provide sufficient evidence to indicate that susceptibility to colds is affected by the number of relationships you have? Test at the 5% significance level.

b. Based on the results of part

a, describe the nature of the relationship between the two categorical variables:
cold incidence and number of social relationships.
Do your observations agree with the author’s conclusions?

Transcribed Image Text:

Number of Relationships Three or Fewer Four or Five Six or More Cold 49 43 34 No Cold 31 57 62 Total 80 100 96