Researchers want to examine whether or not there is a difference in birthweight for mothers who smoke and mothers who do not smoke. Their alternate hypothesis is Ha: μ1 ≠ μ2.They collect smoking status and birthweight information for 189 pregnancies. For your convenience, I have prepared an Excel file with the data titled: data_final_smoking_bw. xlsx. Preview the document Use a t-test to test the hypothesis that there is a difference in birthweight for mothers who smoke and mothers who do not smoke at the α = 0.05 level. Assume unequal variance between the groups. What is the p-value for this result?

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.