All Matches
Solution Library
Expert Answer
Textbooks
Search Textbook questions, tutors and Books
Oops, something went wrong!
Change your search query and then try again
Toggle navigation
FREE Trial
S
Books
FREE
Tutors
Study Help
Expert Questions
Accounting
General Management
Mathematics
Finance
Organizational Behaviour
Law
Physics
Operating System
Management Leadership
Sociology
Programming
Marketing
Database
Computer Network
Economics
Textbooks Solutions
Accounting
Managerial Accounting
Management Leadership
Cost Accounting
Statistics
Business Law
Corporate Finance
Finance
Economics
Auditing
Ask a Question
Search
Search
Sign In
Register
study help
mathematics
introduction to business statistics
Questions and Answers of
Introduction to business statistics
A lake is a body of water surrounded by land. Hence, some bodies of water named seas, like the Caspian Sea, are actual salt lakes. In the table that follows, the length in
Americans become more knowledgeable about computer hardware and software, as prices drop and installation becomes easier, home networking of PCs is expected to penetrate 27 percent of U.S. households
The 2004 election was a race in which the incumbent, George W. Bush, defeated John Kerry, Ralph Nader, and other candidates, receiving 50.7% of the popular vote. The popular vote (in thousands) for
Reconsider the previous two exercises. Students at Cal Poly collected data from their classmates and produced the following two-way table of counts:a. Produce a segmented bar graph to display these
Reconsider the previous two exercises. There were actually three categories of the response variable. The response €œit depends€ had been classified as not trusting people in Exercise Table
State the null and alternative hypotheses to be investigated with this study. (You may use the symbol π to represent these parameters.)
Calculate the conditional proportions of those who didnt yield to the pedestrian for each level of status.The following table provides descriptive statistics on the 152 drivers: Status 4
Calculate the MAD (mean absolute value of the differences) for these data.The following table provides descriptive statistics on the 152 drivers: Status 4 5 3 Did yield 25 20 Didn't yield 8 6 20 20 5
Use the appropriate applet to construct a simulated null distribution using the MAD statistic. Mark the observed MAD statistic calculated in the previous question on this graph.a. Paste a screenshot
Are the validity conditions met to complete a theory-based chi-square test for these data? Explain. Whether the conditions are met or not, use a theory-based chi-square test to find a p-value for
Are the validity conditions met so we can perform follow-up analysis (pairwise comparisons) using theory-based techniques? Explain.
Regardless of your answer to #11, find confidence intervals for each pair of differences in the probabilities of not yielding. Comment on how this shows where differences can be established and
Are you able to conclude that the cause of any differences was due to the class status of the driver? Explain.
What generalizations are you willing to make? Explain.
Summarize the findings from the study. What worked well in this study design? What would you change? What are some follow-up research questions you would like to explore based on the findings from
Suppose you were conducting a simulation with cards to compare the means of three groups of test scores. The groups consisted of samples of size 8, 10, and 12. Which of the following best describes
When determining the p-value using the MAD statistic:A. We always count the values in the null distribution that are greater than or equal to our observed MAD statistic.B. We always count the values
When testing for an association between class level (Freshman, Sophomore, Junior, Senior) and IQ score, which of the following is NOT an appropriate way to write the alternative hypothesis?A. There
Suppose you are comparing just two means. Among the possible statistics you could use is the difference in means, the MAD, or the max − min (the difference between the largest mean and the smallest
Suppose there is no association between class level (Fr, So, Jr, Sr) and the amount of sleep students get per night at a certain college. What does no association imply about the mean sleep hours for
Consider the following four boxplots constructed from the four data sets A, B, C, and D.a. Which data set has the largest interquartile range? Which has the smallest?b. Which data set has the largest
Consider the MAD statistic. What would happen if you did not take absolute values before calculating the sum of differences between group means? Why would this not be a useful calculation without
For its numerator, the MAD statistic uses the sum of absolute pairwise differences. The absolute values get rid of possible negative differences. Instead of taking absolute values, what is another
Suppose three group means are 4, 5, and 10. Compute the value of the MAD statistic.
Suppose four group means are 2, 5, 7, and 8. Compute the value of the MAD statistic.
The plot shows total payroll in millions of dollars for the 30 major league teams of professional baseball sorted by league (National or American) and division (East, Central, West).a. Identify the
Statistics students were surveyed and two of the questions they were asked was what type of cellphone they use (Basic, iPhone, Smart Phone that is not an iPhone) and how much sleep they typically get
Reconsider Exercises 9.1.19 on the game Halo. Besides the number of kills on each level, the students also recorded the number of deaths on each level. Use the simulation based approach to run a test
Hope College students were surveyed and were asked their class level and how many hours of extracurricular activities they participated in during the past month. For the purposes of this exercise, we
Statistics students were surveyed and two of the questions they were asked was what type of cellphone they use (Basic, iPhone®, Smart Phone that is not an iPhone) and how tall they are in inches
Student researchers at Hope College studied the effects of watching certain types of videos on a person’s emotional state. The subjects were randomly shown a short happy video (babies laughing), a
Reconsider Exercise 9.1.15 on video type and emotion. Besides assessing their subjects’ emotional state after watching the videos, they also assessed their mood. The results can be found in the
Reconsider Exercise 9.1.15 on video type and emotion. Besides assessing their subjects’ emotional state after watching the videos, they also assessed their stress. The results can be found in the
Which diet is best? A fairly recent article in the Journal of the American Medical Association (Dansinger, Griffith, Gleason, et al., 2005) reported on a randomized, comparative experiment in which
Halo is a popular science fiction video game. It can be played on different levels. Statistics students at Hope College wanted to determine whether or not the level on which the game was played
Reconsider Exercises 9.1.19 on the game Halo. Besides the number of kills on each level, the students also recorded the number of assists on each level. Use the simulation based approach to run a
Reconsider Exercises 9.1.19 on the game Halo. Besides the number of kills on each level, the students also recorded the number of medals on each level. Use the simulation based approach to run a test
A group of Hope College statistics students wanted to see if there was an association between students’ major and the time (in seconds) it takes them to complete a small Sudoku-like puzzle. They
Reconsider Exercise 9.1.23 on major and time needed to complete a puzzle. There was one outlier in the applied science group. The researchers reported that this subject kept getting distracted while
Reconsider Exercise 9.1.23 on major and time needed to complete a puzzle. Th ere was one outlier in the applied science group. The researchers reported that this subject kept getting distracted while
Suppose two studies are to compare three means. The results are found in the data sets Study1 and Study2.a. Copy and paste the data from Study 1 into the Multiple Means applet and report the three
Is this a randomized experiment or an observational study? Explain how you know.
The observational unit and explanatory variable are the same as in Exercise 9.CE.17. Th e dotplots for Exercise 9.CE.19 are for a third set of response variables: precipitation (a states
The observational unit and explanatory variable are the same as in Exercise 9.CE.17. Consider another four response variables: Year that a state joined the union, number of McDonalds
The U.S. Census Bureau classifies the 50 U.S. states into four regions:Northeast (9 states, New England and Middle Atlantic):CT, ME, MA, NH, NJ, NY, PA, RI, VTSouth (16 states, South Atlantic, East
A British study (North, Shilcock, and Hargreaves, 2003) examined whether the type of background music playing in a restaurant affected the amount of money that diners spent on their meals. The
The two plots below show distributions of age (left panel) and length (right panel) for male and female rattlesnakes caught at two different sites. Here are the four groups:a. Classify each of the
Recorded noise levels in decibels for a sample of locations in four different parts of New York City are shown in the 9.CE.14 dotplots.a. What is the observational unit? What is the response
A study was conducted to investigate whether how well you know a person is associated with your ability to detect a lie told by that person. Ten statements were devised about the researcher (e.g.,
Reconsider the previous exercise.a. Th e data file CarCrashDummiesLog contains the same data but with the response variable being the logarithm (base 10) of the original head injury measurements.
The data file CarCrashDummies contains data on automobile crash test results. The explanatory variable is the number of doors on the vehicle, and the response variable is a measurement of the extent
Each singer in the New York Choral Society in 1979 self-reported his or her height to the nearest inch. Their voice parts in order from highest pitch to lowest pitch are Soprano, Alto, Tenor, and
The file EarningsByDegree contains data from random samples of 50 American adults taken in the year 2000 in each of five categories of higher educational achievement:• Some higher education•
Consider summary statistics from three different studies (A, B, C) presented below:a. Which study provides the least evidence of a significant difference among the group means? Explain your thinking,
Suppose that two different studies (A and B) have the same sample sizes in each of four groups, with similar standard deviations in the four groups. Furthermore, those sample sizes and sample SDs are
Give your own example of a research question that you could use methods of this chapter to investigate. Include the following components:a. The research question itselfb. The observational unitsc.
Is the average of group averages always equal to the overall average? Let’s make this question more precise: Suppose that an instructor teaches four sections of a course, and the average scores on
Why do the μ and x̅ symbols in this chapter have subscripts? What do the subscripts represent?
The symbols μ and x̅ both stand for means or averages but represent different quantities. What’s the difference between μ and x̅?
Suppose that you collect data on heights of singers in order to investigate whether the four different singing parts in a chorus tend to have different heights, on average. Your friend Josephine says
a. If all other things remain the same, then larger differences between group means have what effect on the p-value (smaller, larger, or no effect)?b. If all other things remain the same, then larger
Reconsider the previous exercise of the study of the Hatha yoga, walking exercise, and wait-list control. The researchers were also interested in change in subjects’ perception of their own health.
Reconsider the previous exercise of the study of the Hatha yoga, walking exercise, and wait-list control. Another outcome of interest was change in number of words correctly recalled from a list aft
Reconsider the previous exercise of the study of the Hatha yoga, walking exercise, and wait-list control. Another outcome of interest was change in simple reaction time (msec). Th e researchers
Researchers Oken et al. (Alternative Therapy Health Medicine, 2006) conducted a study where 135 generally healthy men and women aged 65–85 years were randomly assigned to either 6 months of Hatha
Reconsider the previous exercise about the study of the effect of wing length on the flight time of paper helicopters. Recall that there were two wing lengths of interest: 2 cm and 3 cm, and that
In a study of the effect of wing length on the flight time of paper helicopters, two wing lengths were of interest: 2 cm and 3 cm. Two paper helicopters were made, one with a wing length of 2 cm and
Reconsider the previous exercise. In the actual study conducted on the statistics students in California, participants were asked for an amount that they would be willing to donate. Suppose that
Reconsider the previous exercise about the effect of distance on size of donation. In the study conducted on the statistics students in California, there were 14 people assigned to “California,”
Students in a statistics class in a four-year university in California were randomly assigned to be asked one of the following three questions:• Suppose that a part of the state of California was
Reconsider the previous exercise about the effect of social media on a person’s self-esteem. In the actual study conducted by the statistics students, participants were given a score that measured
Reconsider the previous exercise about the effect of social media on a person’s self-esteem. In the actual study conducted by the statistics students, there were 27 people assigned to each of the
A group of statistics students wanted to investigate the effect of social media on a person’s self-esteem. For this purpose, they conducted a study where participants were randomly assigned to one
Refer to the previous three exercises.Perform an appropriate test of significance to determine whether there is a relationship between the level the game is played and if a player wins (1) or loses
Refer to the previous two exercises.a. Use a theory-based approach to run an ANOVA test to investigate whether the average number of medals (data file HaloMedals) is different for at least one of the
Refer to the previous exercise about the popular science fiction video game Halo.a. Use a theory-based approach to run an ANOVA test to investigate whether the average number of assists (data file
Reconsider Exercises 9.1.19–9.1.22 as well as the previous exercise about the popular science fiction video game Halo. Statistics students at Hope College, Holland, Michigan, wanted to determine
Recall Exercises 9.1.19–9.1.22 about the popular science fiction video game Halo. Statistics students at Hope College, Holland, MI, wanted to determine whether or not the level on which the game
Alarming levels of mercury are starting to creep into our food chain: Our fi sh are showing up with levels of mercury in them that used to be absent. Are the mercury levels the same in all fish? The
This question explores a data set considered in Chapter 6 using an independent-samples t-test to make your conclusion. (We will compare those results with the results using ANOVA.) Do heart rates of
Recall Exercise 9.1.18 about the article in the Journal of the American Medical Association (Dansinger, Griffith, Gleason, et al., 2005) that reported on a randomized, comparative experiment in which
The pair of plots below shows two artificial data sets, A and B.a. Which data set will have the larger mean absolute pairwise difference?A. Larger for A than for BB. Larger for B than for AC. Same
Suppose you are conducting an ANOVA test with four groups and each group has a sample size of 20.a. Suppose the variability between groups increases. Does the F-statistic increase or decrease? Does
Suppose you are conducting an ANOVA test in a situation where the alternative hypothesis is true. Are you more likely or less likely to be able to conclude the alternative hypothesis if:a. The
If we are comparing means from three different groups, why would we use ANOVA rather than doing three independent-samples t-tests?
What is an ANOVA test used for?
Refer to the previous exercise about the association between a person’s height and their biological father’s height. Recall that the data file DadandChildHeights contains data for students in a
Refer back to Exercise 10.1.17, which explores the association between children’s heights and (biological) fathers’ heights. The data file DadandChildHeights contains data for students in a
Refer to the previous exercise about the association between a person’s height and their biological mother’s height. Recall that the data fi le MomandChildHeights contains data for students in a
Recall from Exercise 10.1.16 that the data file MomandChildHeights contains data for students in a statistics class on the following two variables: student’s height (inches) and biological
Refer to the previous exercise about the association between maximum speed and maximum height of roller coasters. Recall that the data file Rollercoasters contains data on the maximum speed (miles
Recall from Exercise 10.1.12 that the data file Roller Coasters contains data (collected from www.rcdb.com) on the maximum speed (miles per hour) and the maximum height (feet) for each of a sample of
Refer to the previous exercise about the association between prices and sizes of houses. Recall that the data file HousePrices contains data on prices ($) and sizes (in square feet) for a random
Recall from Exercise 10.1.11 that the data file HousePrices contains data on prices ($) and sizes (in square feet) for a random sample of houses that sold in the year 2006 in Arroyo Grande,
Refer to the previous exercise about the association between the age and price of used Honda Civics. Consider conducting a test of significance to investigate whether the sample data provide strong
The data in the file UsedHondaCivics come from a sample of used Honda Civics listed for sale online in July 2006. Th e variables recorded in this data file are the car’s age (calculated as 2006
Refer to the previous exercise about the association between height and the length of the index finger. Recall that the data file HeightAnd FingerLength contains data on the height (inches) and the
Refer to the previous exercise about the association between height and length of index finger. Recall that the data file HeightAnd FingerLength contains data on the height (inches) and the length of
Recall from Exercise 10.1.13 that the data file HeightAnd FingerLength contains data on the height (inches) and the length of the index finger of the dominant hand (cm) for students in a statistics
Two researchers want to investigate whether there is a relationship between annual company profit ($) and median annual salary paid by the company ($). Researcher Bart collects data on a random
Showing 200 - 300
of 1933
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Last