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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.
A firm plans to hire 100 employees during the year. It expects that 25 of these employees will obtain graduate degrees within the next 5 years of being hired.
Describe the unique fundamentals of a qualtitative research study, addressing the following:
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
Find the value of Proportion and construct a 90% confidence interval for proportion.
Why is cohort studies more expensive than case-control studies? I know one problem is cohort studies often must be followed up for a long period to determine whether the outcome of interest has developed and they are more expense than case-control..
Determining the strength of a correlation is very important to determine how well one variable can predict another. To determine the strength of a correlation, we have to calculate the correlation coefficient, r.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
Professor Brunner had students in his Marketing class rate his performance as Excellent, Good, Fair, or Poor. A graduate student collected the ratings and assured the students that Professor Brunner would not receive them until after the course gr..
A random sample of 70 printers discovered that 20 of them were being used in small businesses. Find the 99% limit for the population proportion of printers that are used in small businesses.
Find the sample size for the 95% confidence interval used to estimate the population proportion.
How much variability will you have if you predict sales with this model?
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