Researchers in Britain asked some people about their daily coffee intake. Of the 22 people from that group who had the highest coffee intake, nine of them reported hearing voices sometimes when no other person was present. Of the 22 people with the lowest coffee intake, three people reported sometimes hearing voices.   Do an appropriate hypothesis test to investigate a possible link between coffee intake and hearing voices.  State your approach, your null hypothesis, give a p-value for the test you did, and state your conclusion in language relevant to this problem (rather than just saying “reject” or “fail to reject” the null hypothesis).

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.