What conclusion will the researchers make regarding the null hypothesis?
What conclusion will the researchers make regarding the null hypothesis? Nurses in an aged care facility are concerned about the incidence of urinary tract infections (UTI) among residents. They wonder whether drinking cranberry juice daily will reduce the number of infections and plan a study to find out. They enrol 240 residents, 120 in each arm. At the end of the study they find that 22 residents who receive cranberry juice develop a UTI, compared with 31 in those who do not.
a) What would be the appropriate statistical test to determine whether this difference is significant?
From the figures we can see that the incidence of UTI in those receiving cranberry juice is 7.5% lower than in those not receiving it (this is called the Absolute Risk Reduction or ARR). The researchers calculate that the 95% confidence intervals around this number are -2.95 and 17.95.
b) Interpret the confidence intervals
d) What conclusion will the researchers make regarding the null hypothesis?
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