3. The chi-square test for goodness of fit No preference A developmental psychologist is studying bonding between healthy newborn babies and immediate family members. He wants to know if one week-old infants use smell to recognize their mothers. To investigate, he selects a random sample of one-week-old infants. Each infant is presented wit garment worn by his or her mother and two garments worn by unrelated women. The psychologist observes which garment each of the infants onents toward The resulting data are summarized in the following table that shows the number of infants who oriented toward each of the three garments. Actual Mother Unrelated Woman 1 Unrelated woman #2 30 The developmental psychologist wants to know if one-week-old intants orient toward the garment of their own mother more often than might occur by chance. He plans to use a chi square test for goodness of fit to test his hypothesis. The null hypothesis, that the one week-old infants have no peeference for the different garments, can be represented by the following where the values specify the proportion of the population of one-week old infants who would orient toward each of the garments: D Actual Mother Unrelated woman al Unrelated Woman #2 Ho: Am 15 Chistest Art Hother woman woman The www.com AVA 2 9. 10 11 12 AA with-0.01, the critical value is Since the chi statistics the critical value, the psychologist the null hypothesis The psychologist conclude that someone week oldinfantsuse smell to recognize their mothers, Grade It Now Save & Continue Continue without saving 3. The chi-square test for goodness of fit No preference A developmental psychologist is studying bonding between healthy newborn babies and immediate family members. He wants to know if one week-old infants use smell to recognize their mothers. To investigate, he selects a random sample of one-week-old infants. Each infant is presented wit garment worn by his or her mother and two garments worn by unrelated women. The psychologist observes which garment each of the infants onents toward The resulting data are summarized in the following table that shows the number of infants who oriented toward each of the three garments. Actual Mother Unrelated Woman 1 Unrelated woman #2 30 The developmental psychologist wants to know if one-week-old intants orient toward the garment of their own mother more often than might occur by chance. He plans to use a chi square test for goodness of fit to test his hypothesis. The null hypothesis, that the one week-old infants have no peeference for the different garments, can be represented by the following where the values specify the proportion of the population of one-week old infants who would orient toward each of the garments: D Actual Mother Unrelated woman al Unrelated Woman #2 Ho: Am 15 Chistest Art Hother woman woman The www.com AVA 2 9. 10 11 12 AA with-0.01, the critical value is Since the chi statistics the critical value, the psychologist the null hypothesis The psychologist conclude that someone week oldinfantsuse smell to recognize their mothers, Grade It Now Save & Continue Continue without saving