Mathematics, 15.02.2021 20:10 isaac7454
Drilling down beneath a lake in Alaska yields chemical evidence of past changes in climate. Biological silicon, left by the skeletons of single-celled creatures called diatoms, measures the abundance of life in the lake. A rather complex variable based on the ratio of certain isotopes relative to ocean water gives an indirect measure of moisture, mostly from snow. As we drill down, we look farther into the past. Here are data from 2300 to 12,000 years ago:Isotope (%) Silicon (mg/g) Isotope (%) Silicon (mg/g) Isotope (%) Silicon (mg/g)β19.90 99 β20.71 152 β21.63 222β19.84 108 β20.80 263 β21.63 233β19.46 116 β20.86 267 β21.19 184β20.20 141 β21.28 294 β19.37 339(a) Make a scatterplot of silicon (response) against isotope (explanatory).Ignoring the outlier, describe the direction, form, and strength of the relationship. The researchers say that this and relationships among other variables they measured are evidence for cyclic changes in climate that are linked to changes in the sun's activity. weak positive associationmoderate positive associationstrong positive associationweak negative associationmoderate negative associationstrong negative association(b) Find the single outlier in the data. This point strongly influences the correlation. What is the correlation with this point? (Round your answer to two decimal places.)What is the correlation without this point? (Round your answer to two decimal places.)(c) Is the outlier also strongly influential for the regression line? Calculate the regression line with the outlier. (Round your slope to two decimal places, round your y-intercept to one decimal place.)y = β x Calculate the regression line without the outlier. (Round your slope to two decimal places, round your y-intercept to one decimal place.)y = β x Draw on your graph the two regression lines.
Answers: 1
Mathematics, 21.06.2019 15:20
(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *β¦ 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, β¦., 1+2+3+β¦ + 99, and 1+2+3+β¦ + 100
Answers: 1
Mathematics, 21.06.2019 17:20
Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?
Answers: 2
Mathematics, 21.06.2019 18:00
Yesterday i ran 5 miles. today, i ran 3.7 miles. did my percent increase, decrease or is it a percent error? plz i need
Answers: 2
Drilling down beneath a lake in Alaska yields chemical evidence of past changes in climate. Biologic...
History, 27.06.2019 05:10
Mathematics, 27.06.2019 05:10
Mathematics, 27.06.2019 05:10
Computers and Technology, 27.06.2019 05:10
Biology, 27.06.2019 05:10
Biology, 27.06.2019 05:10