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In the classic study of infant attachment, Harlow (1959) placed infant monkeys in cages with two artificial surrogate mothers. One "mother" was made from bare wire mesh and contained the baby bottle from which infants could feed. Other mother was made from soft terry cloth and didn't give any access to food. Harlow observed infant monkeys and recorded how much time per day was spent with each mother. In typical day, infants spent total of 18 hours clinging to one of two mothers. If there were no preference between two, you would expect time to be divided evenly, with average of μ = 9 hours for each of mothers. Though, typical monkey spent around 15 hours per day with terry cloth mother pointing to strong preference for soft, cuddly mother. Assume the sample of n = 9 infant monkeys averaged M = 15.3 hours per day with SS = 216 with terry cloth mother. Is this result adequate to conclude that monkeys spent significantly more time with softer mother than would be expected if there were no preference? Use the two-tailed test with α = .05.
The new independent variable improves the predictive power of the regression model.
Suppose that nine additional firms will be added to the bankruptcy rolls during the next quarter. How many of those failures are likely to be attribute to fraud?
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
Discuss ratio, interval, nominal and ordinal variables. Explain what is meant by a margin of error for a confidence interval.
When an experiment is conducted, one variable is manipulated to see the impact on another variable -- that's why experiments address causation.
We code middle-aged Americans as 1 and senior citizens as 0, the logistic regression model for senior citizens
Of 260 females, 224 answered yes. Construct a contingency table to evaluate the probabilities. What is the probability that a respondent chosen at random:
What is Excel formula in B9 giving first value of coefficient in the objective function?
Nationwide, the average waiting time until electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and found that, on the average
An election poll reported that a candidate had an approval rating of 48% with a margin of error E of 3%. Construct a confidence interval for the proportion of adults who approve of the candidate.
Find the value of sample covariance in linear regression model
In optimal solution, determinethe critical path?
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