. Fruit flies, like almost all other living organisms, have built-in circadian rhythms that keep time even in the absence of external stimuli. Several genes have been shown to be involved in internal timekeeping, including per (period) and tim (timeless). Mutations in these two genes, and in other genes, disrupt timekeeping abilities. Interestingly, these genes have also been shown to be involved in other time-related behavior, such as the frequency of wingbeats in male courtship behaviors. Individuals that carry particular mutations of per and tim have been shown to copulate for longer than individuals that have neither mutation. But do these two mutations affect copulation time in similar ways? The following table summarizes some data on the duration of copulation for flies that carry either the tim mutation or the per mutation (Beaver and Giebultowicz 2004): Mean copulation duration (min) Standard deviation of Sample size (n) Mutation copulation duration per 17.5 3.37 14 tim 19.9 2.47 17 a. Do these two mutations lead to different mean copulation durations? Carry out the appropriate test. b. Do the populations carrying these mutations have different variances in copulation duration?

. Fruit flies, like almost all other living organisms, have built-in circadian rhythms that keep time even in the absence of external stimuli. Several genes have been shown to be involved in internal timekeeping, including per (period) and tim (timeless). Mutations in these two genes, and in other genes, disrupt timekeeping abilities. Interestingly, these genes have also been shown to be involved in other time-related behavior, such as the frequency of wingbeats in male courtship behaviors. Individuals that carry particular mutations of per and tim have been shown to copulate for longer than individuals that have neither mutation. But do these two mutations affect copulation time in similar ways? The following table summarizes some data on the duration of copulation for flies that carry either the tim mutation or the per mutation (Beaver and Giebultowicz 2004): Mean copulation duration (min) Standard deviation of Sample size (n) Mutation copulation duration per 17.5 3.37 14 tim 19.9 2.47 17 a. Do these two mutations lead to different mean copulation durations? Carry out the appropriate test. b. Do the populations carrying these mutations have different variances in copulation duration?

Name: ). Fruit flies, like almost all other living organisms, have built-in
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Description: ). Fruit flies, like almost all other living organisms, have built-in circadian rhythms that keeptime even in the absence of external stimuli. Several genes have been shown to be involvedin internal timekeeping, including per (period) and tim (timel

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Every day a school bus driver passes the same traffic light twice, once before school and once after. Each time he passes the light, he records if it is red, green, or yellow. Here is a summary of the data he got after 200 days. Traffic light before school red red red green green green yellow yellow yellow Traffic light after school red green yellow red green yellow red green yellow Number of days 25 38 12 34 36 11 16 13 15 Suppose the driver will continue recording the colors for 150 more days. In how many of these 150 days will the light be yellow exactly once? Use the data to make a prediction.
Part 3
A scientist is interested in whether stretching before running 5 kilometers will improve a runner’s time. The scientist decides that an experimental study is the best method to use to answer the question. One group of runners will run a 5-kilometer race without stretching, and a second group of runners will follow a specific stretching routine before running the race. The finishing times will be recorded, along with the group type for each runner. Assuming this group is representative of all adults who followed a specific stretching routine before running, use a normal distribution to estimate the probability that a randomly-selected adult could complete the race in fewer than 20 minutes after stretching. **THIS IS THE FULL QUESTION AND THIS IS NOT GRADED ***
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In an article in the Journal of Marketing, Bayus studied the differences between "early replacement buyers" and "late replacement buyers" in making consumer durable good replacement purchases. Early replacement buyers are consumers who replace a product during the early part of its lifetime, while late replacement buyers make replacement purchases late in the product's lifetime. In particular, Bayus studied automobile replacement purchases. Consumers who traded in cars with ages of zero to three years and mileages of no more than 35,000 miles were classified as early replacement buyers. Consumers who traded in cars with ages of seven or more years and mileages of more than 73,000 miles were classified as late replacement buyers. Bayus compared the two groups of buyers with respect to demographic variables such as income, education, age, and so forth. He also compared the two groups with respect to the amount of search activity in the replacement purchase process. Variables compared…
Section 3.3 Brent Perry works as a guide and conservationist for an ornithological tourism company, which is part of an emerging industry catering to birders. He recently surveyed the bird populations in some preserved deciduous woodlands in Northern New Jersey. In particular, he was looking for Baltimore Orioles who surprisingly to some have taken up residence in Jersey elms and maples. On five random visits each along five separate and independent mile-long pathways (Trails A through E), he recorded the following numbers of sightings of Baltimore Orioles: Trail A 8 16 8 12 16 Trail B 1 15 9 8 7 Trail C 22 10 16 10 22 Trail D 19 29 24 29 19 Trail E 16 24 16 24 20 He kept other variables about his bird watching as constant as he reasonably could. He wonders if all five pathways provide comparable opportunities to spot these orange-plumed birds. Help Brent with his analysis by completing the following…
A psychologist believed that as children get older, they engage in more “inactive activities” such as playing computer games, watching TV and surfing the internet. She collected data from 10 children. She recorded the age of each child and the amount of activity (in hours) the child engaged in per week. Age Activity 7 4.3 9 3.2 10 1 13 1.5 12 1.2 15 0.8 9 3 12 4 15 1.5 14 1.9 Using excel, obtain a scatterplot of the data. Discuss the relationship between age and activity based on the scatterplot. Using excel, obtain the simple linear regression linear regression line predicting activity from age. Interpret the intercept and slope of the regression line. By hand, predict the amount of activity for age = 14. By hand, calculate the residual for age = 14 Using excel output, test the null hypothesis that the slope coefficient is zero using the p-value approach. Write one sentence interpreting the meaning of this result. Make sure to report the test statistic…
Section 3.4 Brent Perry works as a guide and conservationist for an ornithological tourism company, which is part of an emerging industry catering to birders. He recently surveyed the bird populations in some preserved deciduous woodlands in Northern New Jersey. In particular, he was looking for Baltimore Orioles who surprisingly to some have taken up residence in Jersey elms and maples. On five random visits each along five separate and independent mile-long pathways (Trails A through E), he recorded the following numbers of sightings of Baltimore Orioles: Trail A 8 16 8 12 16 Trail B 1 15 9 8 7 Trail C 22 10 16 10 22 Trail D 19 29 24 29 19 Trail E 16 24 16 24 20 He kept other variables about his bird watching as constant as he reasonably could. He wonders if all five pathways provide comparable opportunities to spot these orange-plumed birds. Help Brent with his analysis by completing the following…