In high-income countries (as defined by the World Bank,) 22% of all babies are breastfed. Tajikistan is considered a low-income country. A researcher collected a random sample of babies from Tajikistan and recorded whether or not the babies were breastfed. The goal of the researcher was to test that the percentage of children who are breastfed in Tajikistan is higher than that of high income countries. Which hypothesis test should be used? O One mean (sigma known) One mean (sigma unknown) Mean of differences, using dependent samples (paired data). Difference of two means (independent samples) O Several means (ANOVA) One proportion. Hide Difference of two proportions Chi-Square test for independence Slope of the regression line