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
statistics
Questions and Answers of
Statistics
A researcher plans to compare two treatment conditions by measuring one sample in treatment 1 and a second sample in treatment 2. The researcher then compares the scores for the two treatments and
Describe the data for a correlational research study. Explain how these data are different from the data obtained in experimental and non-experimental studies, which also evaluate relationships
Describe how the goal of an experimental research study is different from the goal for non-experimental or correlational research. Identify the two elements that are necessary for an experiment to
Strack, Martin, and Stepper (1988) found that people rated cartoons as funnier when holding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them
Judge and Cable (2010) found that thin women had higher incomes than heavier women. Is this an example of an experimental or a non-experimental study?
Two researchers are both interested in the relationship between caffeine consumption and activity level for elementary school children. Each obtains a sample of n = 20 children. a. The first
Place the following sample of n = 20 scores in a frequency distribution table.
For the following set of quiz scores:a. Construct a frequency distribution table to organize the scores. b. Draw a frequency distribution histogram for these data?
Sketch a histogram and a polygon showing the distribution of scores presented in the following table: X _____________ f 7 .................... 1 6 .................... 1 5 .................... 3 4
A survey given to a sample of 200 college students contained questions about the following variables. For each variable, identify the kind of graph that should be used to display the distribution of
Each year the college gives away T-shirts to new students during freshman orientation. The students are allowed to pick the shirt sizes that they want. To determine how many of each size shirt they
A report from the college dean indicates that for the previous semester, the grade distribution for the Department of Psychology included 135 As, 158 Bs, 140 Cs, 94 Ds, and 53 Fs. Determine what kind
For the following set of scoresa. Place the scores in a frequency distribution table. b. Identify the shape of the distribution?
Place the following scores in a frequency distribution table. Based on the frequencies, what is the shape of the distribution?
For the following set of scores:a. Construct a frequency distribution table. b. Sketch a polygon showing the distribution. c. Describe the distribution using the following characteristics: (1) What
Fowler and Christakis (2008) report that personal happiness tends to be associated with having a social network including many other happy friends. To test this claim, a researcher obtains a sample
Complete the final two columns in the following frequency distribution table and then find the percentiles and percentile ranks requested.a. What is the percentile rank for X = 2.5? b. What is the
Construct a frequency distribution table for the following set of scores. Include columns for proportion and percentage in your table.
Complete the final two columns in the following frequency distribution table and then find the percentiles and percentile ranks requested.a. What is the percentile rank for X = 9.5? b. What is the
Complete the final two columns in the following frequency distribution table and then use interpolation to find the percentiles and percentile ranks requested.a. What is the percentile rank for X =
Find the requested percentiles and percentile ranks for the following distribution of quiz scores for a class of N = 40 students.a. What is the percentile rank for X = 15? b. What is the percentile
Use interpolation to find the requested percentiles and percentile ranks requested for the following distribution of scores.a. What is the percentile rank for X = 5? b. What is the percentile rank
The following frequency distribution presents a set of exam scores for a class of N = 20 students.a. Find the 30th percentile. b. Find the 88th percentile. c. What is the percentile rank for X =
Construct a stem and leaf display for the data in problem 6 using one stem for the scores in the 60s, one for scores in the 50s, and so on?
A set of scores has been organized into the following stem and leaf display. For this set of scores: a. How many scores are in the 70s? b. Identify the individual scores in the 70s. c. How many
Use a stem and leaf display to organize the following distribution of scores. Use seven stems with each stem corresponding to a 10-point interval.
Find each value requested for the distribution of scores in the following table.a. nb. ΣXc. ΣX2X ______________ f5 ..................... 24 ..................... 33 ..................... 52
Find each value requested for the distribution of scores in the following table.a. nb. ΣXc. ΣX2X _______________ f5 ........................ 14 ....................... 23 ....................... 32
For the following scores, the smallest value is X = 8 and the largest value is X = 29. Place the scores in a grouped frequency distribution tablea. Using an interval width of 2 points.b. Using an
The following scores are the ages for a random sample of n = 30 drivers who were issued speeding tickets in New York during 2008. Determine the best interval width and place the scores in a grouped
For each of the following samples, determine the interval width that is most appropriate for a grouped frequency distribution and identify the approximate number of intervals needed to cover the
What information can you obtain about the scores in a regular frequency distribution table that is not available from a grouped table? Discuss.
Describe the difference in appearance between a bar graph and a histogram and describe the circumstances in which each type of graph is used?
What general purpose is served by a good measure of central tendency?
A sample of n = 8 scores has a mean of M = 10. If one new person with a score of X = 1 is added to the sample, what is the value for the new mean?
A sample of n = 5 scores has mean of M = 12. If one person with score of X = 8 is removed from the sample, what is the value for the new mean?
A sample of n = 11 scores has a mean of M = 4. One person with a score of X = 16 is added to the sample. What is the value for the new sample mean?
A sample of n = 9 scores has a mean of M = 10. One person with a score of X = 2 is removed from the sample. What is the value for the new sample mean?
A population of N = 20 scores has a mean of ( = 15. One score in the population is changed from X = 8 to X = 28. What is the value for the new population mean?
A sample of n = 7 scores has a mean of M = 9. One score in the sample is changed from X = 19 to X = 5. What is the value for the new sample mean?
A sample of n = 7 scores has a mean of M = 5. After one new score is added to the sample, the new mean is found to be M = 6. What is the value of the new score?
A population of N = 16 scores has a mean of µ = 20. After one score is removed from the population, the new mean is found to be µ = 19. What is the value of the score that was removed?
One sample has a mean of M = 4 and a second sample has a mean of M = 8. The two samples are combined into a single set of scores. a. What is the mean for the combined set if both of the original
One sample has a mean of M = 5 and a second sample has a mean of M = 10. The two samples are combined into a single set of scores. a. What is the mean for the combined set if both of the original
Why is it necessary to have more than one method for measuring central tendency? Discuss.
Explain why the mean is often not a good measure of central tendency for a skewed distribution?
Identify the circumstances in which the median rather than the mean is the preferred measure of central tendency?
For each of the following situations, identify the measure of central tendency (mean, median, or mode) that would provide the best description of the average score: a. A news reporter interviewed
One question on a student survey asks: In a typical week, how many times do you eat at a fast-food restaurant? The following frequency distribution table summarizes the results for a sample of n = 20
A nutritionist studying weight gain for college freshmen obtains a sample of n = 20 first-year students at the state college. Each student is weighed on the first day of school and again on the last
Does it ever seem to you that the weather is nice during the work week, but lousy on the weekend? Cerveny and Balling (1998) have confirmed that this is not your imagination-pollution accumulating
Find the mean, median, and mode for the following sample of scores:
Find the mean, median, and mode for the following sample of scores:
Find the mean, median, and mode for the scores in the following frequency distribution table: X ___________ f 8 .................. 1 7 .................. 4 6 .................. 2 5 ..................
Find the mean, median, and mode for the scores in the following frequency distribution table: X _____________ f 10 .................. 1 9 .................... 2 8 .................... 3 7
For the following samplea. Assume that the scores are measurements of a continuous variable and find the median by locating the precise midpoint of the distribution.b. Assume that the scores are
A sample of n = 7 scores has a mean of M = 9. What is the value of ΣX for this sample?
A population with a mean of µ = 10 has ΣX = 250. How many scores are in the population?
a. What is the general goal for descriptive statistics?b. How is the goal served by putting scores in a frequency distribution?c. How is the goal served by computing a measure of central tendency?d.
In a classic study examining the relationship between heredity and intelligence, Robert Tryon (1940) used a selective breeding program to develop separate strains of "smart rats" and "dumb rats."
In words, explain what is measured by each of the following: a. SS b. Variance c. Standard deviation?
A student was asked to compute the mean and standard deviation for the following sample of n = 5 scores: 81, 87, 89, 86, and 87. To simplify the arithmetic, the student first subtracted 80 points
For the following population of N = 6 scores:a. Calculate the range and the standard deviation. (Use either definition for the range.) b. Add 2 points to each score and compute the range and standard
There are two different formulas or methods that can be used to calculate SS. a. Under what circumstances is the definitional formula easy to use? b. Under what circumstances is the computational
Calculate the mean and SS (sum of squared deviations) for each of the following samples. Based on the value for the mean, you should be able to decide which SS formula is better to use.
The range is completely determined by the two extreme scores in a distribution. The standard deviation, on the other hand, uses every score.a. Compute the range (choose either definition) and the
For the data in the following sample:a. Find the mean and the standard deviation. b. Now change the score of X = 8 to X = 18, and find the new mean and standard deviation. c. Describe how one extreme
Calculate SS, variance, and standard deviation for the following sample of n = 4 scores: 7, 4, 2, 1. (The computational formula works well with these scores.)
Calculate SS, variance, and standard deviation for the following population of N = 8 scores: 0, 0, 5, 0, 3, 0, 0, 4. (The computational formula works well with these scores.)
Calculate SS, variance, and standard deviation for the following population of N = 7 scores: 8, 1, 4, 3, 5, 3, 4. (The definitional formula works well with these scores.)
Calculate SS, variance, and standard deviation for the following sample of n = 5 scores: 9, 6, 2, 2, 6. (The definitional formula works well with these scores.)
Can SS ever have a value less than zero? Explain your answer.
For the following population of N = 6 scores:a. Sketch a histogram showing the population distribution. b. Locate the value of the population mean in your sketch, and make an estimate of the standard
For the following sample of n = 7 scores:a. Sketch a histogram showing the sample distribution.b. Locate the value of the sample mean in your sketch, and make an estimate of the standard deviation
In an extensive study involving thousands of British children, Arden and Plomin (2006) found significantly higher variance in the intelligence scores for males than for females. Following are
In the Preview section at the beginning of this chapter we reported a study by Wegesin and Stern (2004) that found greater consistency (less variability) in the memory performance scores for younger
Is it possible to obtain a negative value for the variance or the standard deviation?
What does it mean for a sample to have a standard deviation of zero? Describe the scores in such a sample.
Explain why the formulas for sample variance and population variance are different?
A population has a mean of µ = 80 and a standard deviation of µ = 20.a. Would a score of X = 70 be considered an extreme value (out in the tail) in this sample?b. If the standard deviation were µ
On an exam with a mean of M = 78, you obtain a score of X = 84. a. Would you prefer a standard deviation of s = 2 or s = 10? b. If your score were X = 72, would you prefer s = 2 or s = 10? Explain
A population has a mean of μ = 30 and a standard deviation of μ = 5.a. If 5 points were added to every score in the population, what would be the new values for the mean and standard deviation?b.
a. After 3 points have been added to every score in a sample, the mean is found to be M = 83 and the standard deviation is s = 8. What were the values for the mean and standard deviation for the
What information is provided by the sign (+/-) of a z-score? What information is provided by the numerical value of the z-score?
Find the z-score corresponding to a score of X = 60 for each of the following distributions.a. µ = 50 and σ = 20b. µ = 50 and σ = 10c. µ = 50 and σ = 5d. µ = 50 and σ = 2
Find the X value corresponding to z = 0.25 for each of the following distributions.a. µ = 40 and σ = 4b. µ = 40 and σ = 8c. µ = 40 and σ = 12d. µ = 40 and σ = 20
A score that is 6 points below the mean corresponds to a z-score of z = -0.50. What is the population standard deviation?
A score that is 12 points above the mean corresponds to a z-score of z = 3.00. What is the population standard deviation?
For a population with a standard deviation of σ = 8, a score of X = 44 corresponds to z = - 0.50. What is the population mean?
For a sample with a standard deviation of s = 10, a score of X = 65 corresponds to z = 1.50. What is the sample mean?
For a sample with a mean of µ = 45, a score of X = 59 corresponds to z = 2.00. What is the sample standard deviation?
For a population with a mean of µ = 70, a score of X = 62 corresponds to z = -2.00. What is the population standard deviation?
In a population of exam scores, a score of X = 48 corresponds to z = +1.00 and a score of X = 36 corresponds to z = -0.50. Find the mean and standard deviation for the population?
In a distribution of scores, X = 64 corresponds to z = 1.00, and X = 67 corresponds to z = 2.00. Find the mean and standard deviation for the distribution?
A distribution has a standard deviation of σ = 12. Find the z-score for each of the following locations in the distribution.a. Above the mean by 3 points.b. Above the mean by 12 points.c. Below the
For each of the following populations, would a score of X = 50 be considered a central score (near the middle of the distribution) or an extreme score (far out in the tail of the distribution)?a. µ
A distribution of exam scores has a mean of µ = 80.a. If your score is X = 86, which standard deviation would give you a better grade: σ = 4 σ = 8?b. If your score is X = 74, which standard
For each of the following, identify the exam score that should lead to the better grade. In each case, explain your answer.a. A score of X = 56, on an exam with µ = 50 and σ = 4; or a score of X =
A distribution with a mean of µ = 62 and a standard deviation of σ = 8 is transformed into a standardized distribution with µ = 100 and σ = 20. Find the new, standardized score for each of the
A distribution with a mean of µ = 56 and a standard deviation of σ = 20 is transformed into a standardized distribution with µ = 50 and σ = 10. Find the new, standardized score for each of the
Showing 81800 - 81900
of 82267
First
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823