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What is the effect of child care on the security of attachment which develops between infant and caregiver. You suspect that infants in child care will be insecurely attached at 11 months after being in a child care from 2 months of age, compared with infants who are cared for at home by their principal caregiver.
What general steps would I take to test my hypothesis?
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
In an exam, the mean score is 70 and the variance is 16. What is the probability that a student's score will lie within the "54 to 86" range?
Your company builds roads, bridges, schools and other multi-million dollar public construction projects. Competitive bids are made for the contracts to undertake these projects. For each project there are three costs:
The gas price index for 1985 was 218.5 and the gas price index for 2000 was 276.8. If it cost $18.13 to fill your gas tank in 1985, how much would it have cost to fill the same tank in 2000?
A filling machine in a brewery is designed to fill bottles with 355 ml of hard cider. In practice, however, volumes vary slightly from bottle to bottle. In a sample of 49 bottles, the mean volume of cider is found to be 354 ml, with a standard dev..
Develop a joint probability table for these data and use the table to answer the remaining questions. What do the marginal probabilities tell you about the age of the US population?
no children which is equal to value obtained by census. Give z statistic (rounded to two decimal places) and P-value. What do you conclude? (Use = 0.10.).
During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes.
Given the following situation, how would you use Megastat to test whether the population defective rate is greater than 5%? Please outline the process for the test and, if necessary, including the output from Megastat to explain your approach.
Determine the probability that the sample mean is 20 or higher? What is the probability that the sample mean falls within 2 points of the population mean?
Compute the z score for the data company. Considering the altman model, comment on the likelihood that this firm will experience financial failures.
Management at the Kansas City Corporate office for tax prepration wants to accomplish a business objective by conduting a study of the waiting time in its tax offices in different states.
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