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Question: Crawling. Researchers at the University of Denver Infant Study Center wondered whether temperature might influence the age at which babies learn to crawl. Perhaps the extra clothing that babies wear in cold weather would restrict movement and delay the age at which they started crawling. Data were collected on 208 boys and 206 girls. Parents reported the month of the baby's birth and the age (in weeks) at which their child first crawled. The table gives the average Temperature (°F) when the babies were 6 months old and average Crawling Age (in weeks) for each month of the year. Make the plots and compute the analyses necessary to answer the following questions.
a) Would this association appear to be weaker, stronger, or the same if data had been plotted for individual babies instead of using monthly averages? Explain.
b) Is there evidence of an association between Temperature and Crawling Age? Test an appropriate hypothesis and state your conclusion. Don't forget to check the assumptions.
c) Create and interpret a 95% confidence interval for the slope of the true relationship.
A farmer has 40m of fencing with which to enclose a rectangular pen.Given that the pen is x m wide - show that it's area is (20x - x^2)m^2 and deduce that the maximum area that he can enclose (Answer given 100m^2).
Use the chi-square test of independence with a .05 level of significance to analyze the data. What is your conclusion?
This problem involves calculating and interpreting the 95% confidence interval for a proportion. While you can use SPSS to determine proportions, you need to calculate the confidence interval by hand.
The faculty senate at a large university wanted to know what proportion of the students thought foreign language classes should be required for everyone.
Last chance for bonus points. In the over-identified case, we could estimate σ2 by fitting (6) to the data, and dividing the sum of the squared residuals by q - p. What's wrong with this idea?
A study was reported about the effects of the number of hours worked, on average, and the average hourly income on unemployment in different countries.3 Suppose that the regression analysis resulted in SSE = 8,650
A SJSU statistics instructor is interested in the median number of classes the state of California college students take. What is the population she is interested in?
1. the distribution of actual weights of 8-oz chocolate bars produced by a certain machine is normal with mean 7.8
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
Give an implementation of adjoin-set using the ordered representation. By analogy with element-of-set? show how to take advantage of the ordering to produce a procedure that requires on the average about half as many steps as with the unordered r..
you are mindlessly piloting your f-14 tomcat home from a mission cruising along at subsonic speed along a horizontal
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