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Cicadas are flying, plant eating insects. One particular species, the 13-year cicadas, spends five juvenile stages in underground borrows. During the 13 years underground, the cicdas grow from approximately the size of a small ant to nearly the size of an adult cicada. The adult body weighs (BW) in frams and wing length (WL) in millimeters are given for three different species of these 13 year cicadas in the following table. BW WL Specie.15 28 Tredecila.29 32 Tredecim.17 27 Tredecim.18 30 Tredecula.39 35 Tredecim.26 31 Tredecim.17 29 tredecassini.16 28 tredecassini.18 29 Tredecila.21 27 tredecassini.15 30 Tredecila.17 27 Tredecila.13 27 Tredecassini.17 29 Tredecassini.23 30 Tredecassini.12 22 Tredecim.14 25 Tredecassini.14 28 Tredecassini.28 25 Tredecassini.12 28 Tredecim.26 30 Tredecila.19 30 Tredecila.20 30 Tredecassini.14 23 TredecilaA. Draw a scatter diagram with body weight as the independent variable and wing length as the dependent variable. Find the equation of the line of best fit. B. Is body weight effective predictor of wing length for a 13 year cicada? Use a .05 level of significance. C. Give a 90% confidence interval for the mean wing length for all .20 gram cicada body weights.
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern. Describe and give examples of research questions in which internal validity is a primary concern.
Today, around the world, Churchill"s name is revered. There are Winston Churchill Societies in most countries. Adolf Hitler and Nazi Germany. Which of these men is a hero? Winston Churchill or Neville Chamberlain?
What is the probability that the project will be completed in 17 months or less?
stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed. What type of sampling should you do? Why?
Assume the variable is normally distributed. If an individual is selected, find the probability that the individual's pressure will be between 120 and 121.8 mmHg.
Let A be the event that the first casting selected is from the local supplier, and let B denote the event that the second casting is selected from the local supplier. Determine: P (A ∩ B)
He received a score of 70 on a biology test for which the class mean was 70 with standard deviation of 4. On which test did he do better relative to the rest of the class?
Find the range and the standard deviation of the times.
A sample of 400 tickets has 72% 1's. What percentage of the entire box do you expect to be 1's? What is the standard error of your estimate?
Is there sufficient evidence to conclude that a significant amount of improvement took place? Calculate the mean and standard deviation. Determine which test statistic applies, and calculate it.
Provided that the selected student excels in sports, determine the probability that the student is a boy?
Find the critical value for a right-tailed F-test when alpha=.05 the degrees of freedom for the numerator (d.f.N.) are 15, and the degrees of freedom for the denominator (d.f.N.) are 21.
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