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Biological clocks. Many plants and animals have "biological clocks" that coordinate activities with the time of day. When researchers looked at the length of the biological cycles in the plant Arabidopsis by measuring leaf movements, they found that the length of the cycle is not always 24 hours. The researchers suspected that the plants adapt their clocks to their north-south position. Plants don't know geography, but they do respond to light, so the researchers looked at the relationship between the plants' cycle lengths and the length of the day on June 21 at their locations. The data file includes data on cycle length and day length, both in hours, for 146 plants.14 Plot cycle length as the response variable against day length as the explanatory variable. Does there appear to be a positive association? Is it a strong association? Explain your answers.
Energizer batteries are considered to be very reliable. Only 0.5% of batteries produced are defective. A purchaser would like to know the probability that more than 100 batteries are defective out of a shipment of 20,000 batteries. Which of the fo..
Create an R chart for these data, using subgroups of size 4. Is the process variation under control?
the weight of a product is normally distributed with a standard deviation of 1.0 ounces. what should the average weight
Using the data of Table 8.8 carry out a principal components analysis of the object correlation matrix using (a) Spearman's rho and (b) Kendall's tau correlation coefficients What do you conclude?
What is the difference between covalent bonds and ionic bonds as used in chemistry?
A W16×45 structural steel beam is simply supported on a span length of 24 ft. It is subjected to two concentrated loads of 12 kips each applied at the third point ( a=8 ft ). Compute the maximum deflection.
If the autoeorrelation lag entries of matrix R1 of Eq. (7.45) correspond to thosc of an ARMA process of ordcr (p1, q1, the rank of R1 isp1, provided that p ≥ p1 and q ≥ p1.
Write a summary that includes only the ones that you have encountered previously and that you believe are effective in describing the data.
About 68% of the students at fairview community college favor a new policy regarding parking on campus. suppose that we are interested in the proportion of 45 students in a math class who favor the policy.
the mean height of adult women is 63.6 inches with a standard deviation of 2.5 inches. forty 40 women were asked their
A photograph of a large crowd on a beach is taken from a helicopter. The photo is of such high resolution that when sections are magnified, individual people.
The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected.
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