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How does variablity in a population influence standard error of the mean? if you were studying the effect of puppies on happiness, a variable with a large standard deviation, how would you adjust your sample size in order to detect an effect of puppies on happiness? How is this releated to the law of diminishing returns?
Considering the four weights and assuming the weights are independent with a constant variance, obtain the least square weights of A and B.
let w be a random variable giving the number of heads minus the number of tails in three tosses of a coin. list the
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
At some point too much stimulation will limit the ability to focus and pay attention. What would happen to the size and the sign of the correlation coefficient if we correlated these two variables?
in usa today sept. 5 1996 the results of a survey involving the use of sleepwear while traveling were listed as
q1.a psychologist dr. bill mikalek administered a test of manual dexterity to 30 third-graders. the times in minutes
Do you agree that if two events are mutually exclusive then these two events will be independent and provide one business-related example each, with explanation, for mutually exclusive and independent events
Do these results suggest that the different therapies have different effects on mental health? (Use the .05 level.) a. Use the five steps of hypothesis testing.
The lengths of pregnancies are normally distributed with a mean of 264 days and a standard deviation of 25 days. If 100 women are randomly selected, find the probability that they have a mean pregnancy between 264 days and 266 days.
Critically discuss the assumptions, if any, regarding a Chi-square test? What are the assumptions to apply linear regression?
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important?
One group is given the new drug and the other group is given the standard drug. Data are recorded on the effects of each drug. Is the research division using dependent or independent samples? Why?
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