Category: Mathematics

  

Quiz: Statistical Concepts 

1) IQ scores tend to be fairly stable over time. This is because IQ tests have high:

a) Validity

b) Reliability

c) Measurement error

d) Cultural fairness

2) IQ scores correlate highly with academic performance. This is an example of IQ test:

a) Validity

b) Reliability

c) Discrimination

d) Parallelism

3) Knowing a test’s standard error of measurement tells us:

a) The likelihood of scoring errors

b) How test taker distractibility distorts responses

c) The likelihood that test takers will answer questions incorrectly

d) How many points test scores are likely to vary over time

4) Dr. Hathaway writes the following statement in a test report: “Jennifer’s Verbal Comprehension Index of 102 is slightly higher than her Perceptual Organization Index of 99. This difference reflects slightly stronger verbal than non-verbal skills.” This statement:

a) Accurately describes a significant VCI/POI difference

b) Is inaccurate because the score difference is non-significant

c) Is accurate because the non-significant VCI/POI difference is described as “slight.”

d) Is inaccurate because the VCI is above average, the POI is below average, and thus the difference is not “slight.”

5) Jose’s WRAT-IV Spelling score is significantly higher than his Word Reading score, at a 5% level of significance. This means that:

a) Only 5% of the population has a difference between these scores at least as large as Jose’s

b) There is a 95% chance that Jose’s Spelling score will still be higher than Word Reading if Jose is retested

c) There is a 5% chance that the Spelling/Word Reading difference is due to test error

d) Both b and c 

6) Convert a WAIS-IV IQ (Mean = 100, s = 15) of 95 to a z-score:

a) -0.05

b) -0.33

c) -0.95

d) 6.33

7) A z-score of 0.5 is at what percentile?

a) 25th

b) 50th

c) 69th

d) 84th

8) Abdul obtains a score of 13 on the WAIS-IV Block Design test. If this is the only information that you have, your best estimate of his IQ would be:

a) 87

b) 113

c) 115

d) 130

9) Someone who obtains a T-score of 60 on the MMPI-II Depression scale is scoring higher than what percent of the population?

a) 60%

b) 70%

c) 80%

d) 84%

10) Factor analysis is:

a) A statistical method that shows how variables cluster, based on the correlations between them

b) A modern form of psychoanalysis

c) A way to determine if group means are significantly different

d) A way to draw causal inferences from correlations between variables

Directions: Answer each question completely, showing all your work. Refer to the SPSS tutorials located in the Topic 4 materials as needed. Copy and Paste the SPSS output into the word document for the calculations portion of the problems. (Please remember to answer the questions you must interpret the SPSS output).

1.  A researcher is interested to learn if there is a linear relationship between the hours in a week spent exercising and a persons life satisfaction. The researchers collected the following data from a random sample, which included the number of hours spent exercising in a week and a ranking of life satisfaction from 1 to 10 ( 1 being the lowest and 10 the highest). 

Participant.    Hours Of exercise       Life Satisfaction.

1                                    3                                                              1

2                                    14                                                            2

3                                    14                                                            4

4                                     14                                                           4

5                                     3                                                             10

6                                   5                                                                 5

7                                    10                                                              3

8                                   11                                                               4

9                                     8                                                                 8

10                                  7                                                                 4

11                                    6                                                                9

12                                   11                                                               5

13                                    6                                                                  4

14                                    11                                                              10

15                                     8                                                                4

16                                     15                                                                7

17                                     8                                                                  4

18                                     8                                                                   5

19                                      10                                                                4

20                                      5                                                                    4

2.  Find the mean hours of exercise per week by the participants.

3.  Find the variance of the hours of exercise per week by the participants.

4.  Determine if there is a linear relationship between the hours of exercise per week and the life satisfaction by using the correlation coefficient.

5.  Describe the amount of variation in the life satisfaction ranking that is due to the relationship between the hours of exercise per week and the life satisfaction.

6.  Develop a model of the linear relationship using the regression line formula.

Answer the following questions in a paragraph. Use Apa Style and avoid plagiarism. Use citations and references. Make the assignment in Spanish.

1. What are the advantages and disadvantages of using a bar chart, pie chart or Pareto chart?

2. Contrast the bar chart for categorical data with the histogram for numerical data.

3. What types of percentages can help interpret the results obtained in a contingency table based on two categorical variables?

4. What are some ethical aspects that must be present when presenting data in tables and graphs?

  Explain the importance of variation to health care organizations and answer the following questions in the space provided below.
1. What might be the key processes for health care organizations?
2. What are the potential common causes of variation that would have an impact on the key processes of health care organizations?
3. What special causes might be more important than the others?
4. How might health care organizations’ business environment be dynamic and change over time?

 

  

Homework Assignment 1 

Due in Week 1 and worth 30 points

Describe a work task, a hobby, or another activity that you regularly do, and sequentially list the various actions you take in order to complete this activity. You will need to repeat this activity at least two times to see if the changes you engage in will assist in reducing the amount of time. Consider the complexity of your list and the amount of steps required to complete the activity. Choose an activity that you complete on a daily basis. 

Please consider the choices below or select one task from personal experience:

Preparing for a jog, workout, or other sports related activity.

Cooking a meal or preparing a sandwich.

Making coffee in the morning.

Cleaning the house.

Washing the car.

Bathing/grooming your dog or cat.

Setting up a grill to BBQ.

Answer the following questions in the space provided below:

1. How many steps did it take you to complete the activity?

2. What time did each step take and how much time was delayed between steps?

3. What was the average time each attempt took? Calculate the average of each repetition. Include your data following the assignment one example provided under Instructor Insights Week 1

4. Differentiate the main actions between doing and improving your activities. Use the textbook to support your explanation. See page 7-9.

5. Determine the overall manner in which variation has affected your activities. Explain what is variation and the importance of the standard deviation in a process? You will need to calculate the standard deviation of each attempt. Include your data and calculation. See page 13-14 to support your answer.

6. Overall, how much time were you able to cut down on when engaging in the same activity while implementing the new changes?

 Respond to the following in a minimum of 175 words: 

The Tasty Sub Shop Case:

A business entrepreneur uses simple linear regression analysis to predict the yearly revenue for a potential restaurant site on the basis of the number of residents living near the site. The entrepreneur then uses the prediction to assess the profitability of the potential restaurant site.

And

The QHIC Case:

The marketing department at Quality Home Improvement Center (QHIC) uses simple linear regression analysis to predict home upkeep expenditure on the basis of home value. Predictions of home upkeep expenditures are used to help determine which homes should be sent advertising brochures promoting QHICs products and services.

Discuss the difference in the type of prediction in both cases and provide rational of the reasons that these predictions were used.

 

Use the normal distribution of IQ scores, which has a mean of 105105
and a standard deviation of 1212,
and the following table with the standard scores and percentiles for a normal distribution to find the indicated quantity.
LOADING…
Click the icon to view the table.

Percentage of scores less than 8181
is nothing%.
(Round to two decimal places as needed.)