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A researcher was interested in whether the cranial capacity of one species of primates was larger than the cranial capacity of another species. She collected 8 random skulls from species 1 and 9 random skulls from species 2. These were the cranial capacities of the skulls in mm2: species1 <- c(92.0, 157.2, 104.0, 99.8, 102.8, 176.2, 64.0, 113.4) species2 <- c(40.9, 127.3, 101.8, 147.2, 50.5, 75.7, 71.8, 121.5, 86.8) Perform a one-tailed two-sample Welch's t-test on these data in R, to test if the data from species 1 comes from a population with a mean greater than species2. What are the degrees of freedom [ Select ] 15 17 What is the observed t-value? [ 16 14.74 What is the lower bound of the 95% Confidence Interval for the difference in means? [ Select] What is the p-value? (Select] Does this test suggest that the population mean of cranial capacities in species A is larger than species B? [Select]
A researcher was interested in whether the cranial capacity of one species of primates was larger than the cranial capacity of another species. She collected 8 random skulls from species 1 and 9 random skulls from species 2. These were the cranial capacities of the skulls in mm2: species1 <- c(92.0, 157.2, 104.0, 99.8, 102.8, 176.2, 64.0, 113.4) species2 <- c(40.9, 127.3, 101.8, 147.2, 50.5, 75.7, 71.8, 121.5, 86.8) Perform a one-tailed two-sample Welch's t-test on these data in R, to test if the data from species 1 comes from a population with a mean greater than species2. What are the degrees of freedom ? [ Select] What is the observed t-value [Select ] 1.9 1.27 What is the lower bound of th 1.2 he difference in means? [ Select] What is the p-value? (Select] Does this test suggest that the population mean of cranial capacities in species A is larger than species B? [Select]
A researcher was interested in whether the cranial capacity of one species of primates was larger than the cranial capacity of another species. She collected 8 random skulls from species 1 and 9 random skulls from species 2. These were the cranial capacities of the skulls in mm2: species1 <- c(92.0, 157.2, 104.0, 99.8, 102.8, 176.2, 64.0, 113.4) species2 <- C(40.9, 127.3, 101.8, 147.2, 50.5, 75.7, 71.8, 121.5, 86.8) Perform a one-tailed two-sample Welch's t-test on these data in R, to test if the data from species 1 comes from a population with a mean greater than species2. What are the degrees of freedom ? [Select] What is the observed t-value? (Select) What is the lower bound of the 95% Confidence Interval for the difference in means [Select ] -8.54 -15.2 What is the p-value? (Select] -8.49 Does this test suggest that the population mean of cranial capacities in species A is larger than species B? (Select]
A researcher was interested in whether the cranial capacity of one species of primates was larger than the cranial capacity of another species. She collected 8 random skulls from species 1 and 9 random skulls from species 2. These were the cranial capacities of the skulls in mm2: species1 <- c(92.0, 157.2, 104.0, 99.8, 102.8, 176.2, 64.0, 113.4) species2 <- C(40.9, 127.3, 101.8, 147.2, 50.5, 75.7, 71.8, 121.5, 86.8) Perform a one-tailed two-sample Welch's t-test on these data in R, to test if the data from species 1 comes from a population with a mean greater than species2. What are the degrees of freedom ? [Select] What is the observed t-value? (Select) What is the lower bound of the 95% Confidence Interval for the difference in means? [ Select] What is the p-value [Select] 0.11 0.13 Does this test sugge 0.22 franial capacities in species A is larger than species B? [Select]
A researcher was interested in whether the cranial capacity of one species of primates was larger than the cranial capacity of another species. She collected 8 random skulls from species 1 and 9 random skulls from species 2. These were the cranial capacities of the skulls in mm2: species1 <- c(92.0, 157.2, 104.0, 99.8, 102.8, 176.2, 64.0, 113.4) species2 <- C(40.9, 127.3, 101.8, 147.2, 50.5, 75.7, 71.8, 121.5, 86.8) Perform a one-tailed two-sample Welch's t-test on these data in R, to test if the data from species 1 comes from a population with a mean greater than species2. What are the degrees of freedom ? [Select] What is the observed t-value? (Select) What is the lower bound of the 95% Confidence Interval for the difference in means? [ Select] What is the p-value? (Select] Does this test suggest that the population mean of cranial capacities in species A is larger than species B [ Select ] No Yes