QUESTION 3

1. 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?

H₀:= 18 versusH_a:< 18

H₀:= 6.9 versusH_a:< 8.2

H₀:= 18 versusH_a:< 18

H₀:= 7.55 versusH_a:7.55