The clinical literature reports that the duration of a typical cold is roughly 18 days. Researchers wanted to know if people tend to underestimate the duration of a typical cold, on average. They surveyed a random sample of 352 healthy adults in Georgia and asked them how long they think that a typical cold lasts. The researchers reported a 95% confidence interval of 6.9 to 8.2 days for the mean expected duration of typical cold. What are the null and alternative hypotheses that these researchers wanted to test?

Question

Quizplus · Accepted Answer

The null hypothesis is that the mean duration of a typical cold is 18 days (μ = 18), and the alternative hypothesis is that people underestimate this duration, meaning they believe it is less than 18 days on average (μ < 18).

The Clinical Literature Reports That the Duration of a Typical