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Privitera - Stats for the Behavioral Sciences 3/e (Homework)

James Finch

Statistics, section 2, Fall 2019

Instructor: Dr. Friendly

Current Score : 15 / 39

Due : Sunday, January 27, 2030 23:30 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8 9 10
2/2 1/1 0/5 3/5 2/3 4/4 3/4 0/3 –/10 –/2
Total
15/39 (38.5%)

  • Instructions

    Statistics for the Behavioral Sciences, Third Edition, written by Gregory J. Privitera and published by SAGE Publications, engages students in an ongoing spirit of discovery by illustrating how statistics applies to modern-day research problems. By integrating robust pedagogy as well as screenshots and practical examples for using IBM SPSS® Statistics software, award-winning author Gregory J. Privitera balances statistical theory, computation, and application with the technical instruction needed for students to succeed in the modern era of data collection, analysis, and statistical interpretation. Fully updated with current research and a full-color design, this new edition features even more real-world examples and an updated Student Study Guide with SPSS Workbook.

    Question 1 highlights word answers such as “class” and “amount” to describe qualitative versus quantitative variables.

    Question 2 includes a graphical summary display for analyzing data.

    Question 3 showcases the ability to grade stem-and-leaf plots.

    Question 4 is a multi-part question demonstrating randomization values for hypothesis testing.

    Question 5 demonstrates how images can be randomized in addition to the standard practice of randomized numbers for the mean of a sampling distribution.

    Question 6 illustrates questions presented in a collapsible form so that students can focus on working through the problem one part at a time.

    Question 7 features a prompt for “infinity” answers and includes a link to the appropriate statistical table from the appendix so that all of the relevant information is easily accessible.

    Question 8 exhibits randomized data for finding 95% confidence limits, including prompts for rounding, multiple selections for determining a two-tailed hypothesis test conclusion, and a link to the appropriate statistical table.

    Question 9 demonstrates an ANOVA table layout with answer boxes.

    Question 10 allows a student to enter their equation values individually for finding a regression equation. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 2/2 points  |  Previous Answers PriviteraStats3 1.E.009. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
1/100 1/100
Total
2/2
 
A qualitative variable varies by Correct: Your answer is correct. seenKey

class

 ; a quantitative variable varies by Correct: Your answer is correct. seenKey

amount

 .

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2. 1/1 points  |  Previous Answers PriviteraStats3 1.TB.025. My Notes
Question Part
Points
Submissions Used
1
1/1
7/100
Total
1/1
 
Based on the following graphical summary display, what research design was used to record and analyze these data?
    
     Correct: Your answer is correct.

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3. 0/5 points  |  Previous Answers PriviteraStats3 2.E.021. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
0/1 –/1 –/1 –/1 –/1
1/100 0/100 0/100 0/100 0/100
Total
0/5
 
Organize the following data into a stem-and-leaf display where the following is true. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.)
124, 186, 249, 185, 189, 248, 242, 246, 123, 244
241, 189, 182, 126, 127, 184, 241, 129, 184, 121
(a) the stem has one digit
Stem Leaf
1 Incorrect: Your answer is incorrect. seenKey

21 23 24 26 27 29 82 84 84 85 86 89 89
2

(b) the leaf has one digit
Stem Leaf
12
18
24
Make sure all common values are to the left in the stem.

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4. 3/5 points  |  Previous Answers PriviteraStats3 4.E.011. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
1/1 1/1 1/1 0/1 0/1
1/100 1/100 1/100 1/100 1/100
Total
3/5
 
A social scientist measures the number of minutes (per day) that a small hypothetical population of college students spends online.
Student Score Student Score
A 88 F 94
B 83 G 69
C 94 H 78
D 99 I 92
E 88 J 37
(a) What is the range of data in this population?
Correct: Your answer is correct. seenKey

62

 min

(b) What is the IQR of data in this population?
Correct: Your answer is correct. seenKey

16

 min

(c) What is the SIQR of data in this population?
Correct: Your answer is correct. seenKey

8

 min

(d) What is the population variance?
Incorrect: Your answer is incorrect. seenKey

295.96

(e) What is the population standard deviation? (Round your answer to two decimal places.)
Incorrect: Your answer is incorrect. seenKey

17.20

 min
For each calculation, note that there are 10 scores in which the highest score is 99 and the lowest score is 37.

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5. 2/3 points  |  Previous Answers PriviteraStats3 7.E.023. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 0/1
1/100 1/100 1/100
Total
2/3
 
A population is normally distributed with a mean of 55 and a standard deviation of 15.
(a) What is the mean of the sampling distribution (μM) for this population?
μM = Correct: Your answer is correct. seenKey

55

(b) If a sample of 25 participants is selected from this population, what is the standard error of the mean (σM)?
σM = Correct: Your answer is correct. seenKey

3

(c) Sketch the shape of this distribution with
M ± 3 SEM.

Incorrect: Your answer is incorrect.
Construct a sampling distribution as described in Section 7.3.

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6. 4/4 points  |  Previous Answers PriviteraStats3 8.E.017. My Notes
Question Part
Points
Submissions Used
1 2 3 4
1/1 1/1 1/1 1/1
1/100 1/100 1/100 1/100
Total
4/4
 
The weight (in pounds) for a population of school-aged children is normally distributed with a mean equal to 121 ± 17 pounds (μ ± σ). Suppose we select a sample of 100 children (n = 100) to test whether children in this population are gaining weight at a 0.05 level of significance.

  • Part (a)

    What are the null and alternative hypotheses?
         Correct: Your answer is correct.

  • Part (b)

    What is the critical value for this test?
    Correct: Your answer is correct. seenKey

    1.645

  • Part (c)

    What is the mean of the sampling distribution?
    Correct: Your answer is correct. seenKey

    121

         lb

  • Part (d)

    What is the standard error of the mean for the sampling distribution?
    Correct: Your answer is correct. seenKey

    1.7

         lb


You may need to use the appropriate table in Appendix C to answer this question.

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7. 3/4 points  |  Previous Answers PriviteraStats3 9.E.015. My Notes
Question Part
Points
Submissions Used
1 2 3 4
1/1 0/1 1/1 1/1
1/100 1/100 1/100 1/100
Total
3/4
 
State the total degrees of freedom for the following t-tests. (If you need to use ∞, enter INFINITY.)
(a)
n = 18
 for a one-independent sample t-test
Correct: Your answer is correct. seenKey

17

(b)
df1 = 11, n2 = 16
 for a two-independent sample t-test
Incorrect: Your answer is incorrect. seenKey

26

(c) critical value = 63.657 for a two-tailed test,
α = 0.01

Correct: Your answer is correct. seenKey

1

(d) critical value = 1.645 for a one-tailed test,
α = 0.05

Correct: Your answer is correct. seenKey

INFINITY


You may need to use the appropriate table in Appendix C to answer this question.
Recall that the degrees of freedom are n − 1 per group or sample.

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8. 0/3 points  |  Previous Answers PriviteraStats3 11.E.023. My Notes
Question Part
Points
Submissions Used
1 2 3
0/1 0/1 0/1
1/100 1/100 1/100
Total
0/3
 
Forest bathing, also called Shinrin-yoku, is the practice of taking short, leisurely walks in a forest to enhance positive health. To test the usefulness of this practice, the time forest bathing per day was recorded among eight patients with depression who subsequently showed a marked reduction in their symptoms over the last week. The data are given in the table.
Time Spent in the Forest (in hours)
4.1
4.9
5.0
3.7
4.3
5.4
4.2
4.4
(a) Find the confidence limits at a 95% CI for this sample. (Round your answers to two decimal places.)
Incorrect: Your answer is incorrect. seenKey

4.04

 to Incorrect: Your answer is incorrect. seenKey

4.96

 hours per day

(b) Suppose the null hypothesis states that the average time spent forest bathing among patients is 3.5 hours per day. What would the decision be for a two-tailed hypothesis test at a 0.05 level of significance?
     Incorrect: Your answer is incorrect.


You may need to use the appropriate table in Appendix C to answer this question.
Follow the steps for finding the CI for one-sample (Section 11.4) and refer to the Making Sense section on page 343.

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9. –/10 points PriviteraStats3 12.E.027. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100
Total
–/10
 
An educator wants to evaluate four different methods aimed at reducing the time children spend "off task" in the classroom. To test these methods, she implements one method in each of four similar classrooms and records the time spent off task (in minutes) in each classroom. The results are given in the table.
Classroom Method
A B C D
0 0 4 2
4 4 3 5
5 3 5 2
4 2 3 3
2 1 1 4
1 6 6 3
2 1 5 4
3 0 0 2
1 4 4 5
(a) Complete the F-table. (Round your answers to two decimal places.)
Source of
Variation 		SS df MS F
Between
groups
Within
groups (error) 		 
Total    

(b) Is it necessary to compute a post hoc test? Explain. (Assume alpha equal to 0.05.)
    


You may need to use the appropriate table in Appendix C to answer this question.

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10. –/2 points PriviteraStats3 16.E.021. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
An instructor measured quiz scores and the number of hours studying among a sample of 20 college students. If
SSXY = 47,
SSX = 96,
MY = 7,
 and
MX = 5,
 then what is the regression equation for this sample? (Round your numerical values to three decimal places.)
Y hat = X +

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