Question

Scenario 1: From the NY Times, April 27, 2015 A diet high in potassium appears to protect teenagers from high blood pressure in adulthood, while a low-salt diet has no effect, according to new research. A new study tracked the eating habits and blood pressure of 2,185 nine and ten year-old girls for almost 10 years. The study found that sodium intake had no long-term effect on the girls’ blood pressure. However, they did find that girls who ate diets high in potassium throughout adolescence had lower blood pressure than girls who ate fewer potassium-rich foods. If the researchers wanted to compare blood pressure for the sample of girls across two different time periods, which statistical test would they use?

a. Dependent t-test b. Independent t-test c. One-sample t-test d. One-sample z-test e. One-way ANOVA test f. Pearson correlation test

Scenario 1: From the NY Times, April 27, 2015 A diet high in potassium appears to protect teenagers from high blood pressure in adulthood, while a low-salt diet has no effect, according to new research. A new study tracked the eating habits and blood pressure of 2,185 nine and ten year-old girls for almost 10 years. The study found that sodium intake had no long-term effect on the girls’ blood pressure. However, they did find that girls who ate diets high in potassium throughout adolescence had lower blood pressure than girls who ate fewer potassium-rich foods. What statistical test would be performed to compare the two groups of girls (i.e., those who ate diets high in potassium and those who diets high in sodium intake) on blood pressure?

a. Dependent t-test b. Independent t-test c. One-sample t-test d. One-sample z-test e. One-way ANOVA test f. Pearson correlation test

Answer 1

Answer: _ Part-1 We will use independent t test because there are two populations pertaining to Date: -03/05/2019 different time periods and we want to test for the variable blood pressure. Hence option b is correct. Part-2 Independent t-tests would be performed to compare the two groups of girls. As both group consist of different age group girls and independent too.!! Option b is correct