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Fluid loss in crab spiders. A group of University of Virginia biologists studied nectivory (nectar drinking) in crab spiders to determine if adult males were feeding on nectar to prevent fluid loss (Animal Behavior, June 1995). Nine male spiders were weighed and then placed on the flowers of Queen Anne's lace. One hour later, the spiders were removed and reweighed. The evaporative fluid loss (in milligrams) of each of the nine male spiders is given in the table.
(a) Summarize the fluid losses of male crab spiders with a stem-and-leaf display.
(b) Of the nine spiders, only three drank any nectar from the flowers of Queen Anne's lace. These three spiders are identified as G, H, and I in the table. Locate and circle these three fluid losses on the stem-and-leaf display. Does the pattern depicted in the graph give you any insight into whether feeding on flower nectar reduces evaporative fluid loss for male crab spiders? Explain.
If the doctor wants to use height to predict head circumference run a linear regression on the data. Find the r-value and comment about it.
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution. a
1. If 8.78 g of CuNO3 is dissolved in water to make a 0.630 M solution, what is the volume of the solution? 2. How many milliliters of 11.5 M HCl(aq) are needed to prepare 520.0 mL of 1.00 M HCl(aq)?
The speeds of vehicles (in mph) passing through a section of Highway 75 are recorded for a random sample of 150 vehicles and are given below. Test the hypothesis that the speeds are normally distributed with a mean of 70 and a standard deviation o..
a researcher can test at the
30% of households say they would feel secure if they had $50,000 in savings. you randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings. find the probability that the number that say they would feel secu..
Suppose an Atlantic croaker fish is randomly selected. Find the probability that length of the fish is between 8.5 inches and 10.5 inches.
A magnetic tape recorder transport for modern computers requires a high-accuracy, rapid-response control system. The requirements for a specific transport are as follows: (1)
if we have a uniform random variable that takes values between 7 and 10.5 the graph for the distribution would have a
The estimated proportion nonconforming of the transmission systems is 0.003. Using Deming's kp rule, what inspection policy should be used?
A random sample of 30 days gives a sample mean of 1,482 and the population standard deviation is 430. Construct a 95% confidence interval. What should be the company's decision?
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