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Privitera - Statistics for the Behavioral Sci. 2/e (Homework)

James Finch

Statistics, section 2, Fall 2019

Instructor: Dr. Friendly

Current Score : 38 / 38

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

Last Saved : n/a Saving...  ()

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38/38 (100.0%)

  • Instructions

    Here are some textbook questions from Statistics for the Behavioral Sciences 2/e by Gregory J. Privitera published by SAGE Publications.

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    Click here for a list of all of the questions coded in WebAssign. 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.

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1. –/2 points PriviteraStats2 1.E.009. My Notes
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A quantitative variable varies by ; a qualitative variable varies by .

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2. –/2 points PriviteraStats2 2.E.037. My Notes
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In February 2009, the Harris Poll asked a sample of Americans whether they thought churches and religious groups have too much or too little power and influence on Washington†. The opinions of Americans were 34% too much, 57% too little, 4% just right, and 5% unsure.
(a) What type of distribution is this?
    

(b) Knowing that 1,010 adults were polled nationwide, how many Americans polled felt that churches and religious groups have too little power and influence on Washington? (Round your answer to the nearest whole number.)
Americans

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3. –/3 points PriviteraStats2 3.E.011. My Notes
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The following frequency distribution table lists the time (in minutes) that participants were late for an experimental session. Compute the sample mean, median, and mode for these data.
mean     min
median     min
mode     min
Time (min) Frequency
0 5
5 3
6 2
7 1
9 2

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4. –/3 points PriviteraStats2 4.E.017. My Notes
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A psychopathologist records the number of criminal offenses among teenage drug users in a nationwide sample of 1,501 participants. To measure the variance of criminal offenses, he computes SS = 24,000 for this sample.
(a) What are the degrees of freedom for variance?


(b) Compute the variance and standard deviation.
variance    
standard deviation    

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5. –/4 points PriviteraStats2 6.E.017. My Notes
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A sample of final exam scores is normally distributed with a mean equal to 28 and a variance equal to 25.

  • Part (a)

    What percentage of scores are between 23 and 33? (Round your answer to two decimal places.)
    %


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

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6. –/3 points PriviteraStats2 7.E.023. My Notes
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A population is normally distributed with a mean of 67 and a standard deviation of 12.
(a) What is the mean of the sampling distribution (μM) for this population?
μM =

(b) If a sample of 36 participants is selected from this population, what is the standard error of the mean (σM)?
σM =

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

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7. –/4 points PriviteraStats2 8.E.015. My Notes
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The weight (in pounds) for a population of school-aged children is normally distributed with a mean equal to 139 ± 25 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?
        


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

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8. –/3 points PriviteraStats2 11.E.023. My Notes
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Listening to music has long been thought to enhance intelligence, especially during infancy and childhood. To test whether this is true, a researcher records the number of hours that eight high-performing students listened to music per day for 1 week. The data are listed in the table.
Music Listening Per
Day (in hours)
4.3
4.9
5.0
3.7
4.3
5.5
4.2
4.3
(a) Find the confidence limits at a 95% CI for this one-independent sample. (Round your answers to two decimal places.)
to hours per day

(b) Suppose the null hypothesis states that students listen to 3.5 hours of music per day. What would the decision be for a two-tailed hypothesis test at a 0.05 level of significance?
    


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

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9. –/11 points PriviteraStats2 12.E.025. My Notes
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Iconic memory is a type of memory that holds visual information for about half a second (0.5 seconds). To demonstrate this type of memory, participants were shown three rows of four letters for 50 milliseconds. They were then asked to recall as many letters as possible, with a 0-, 0.5-, or 1.0-second delay before responding. Researchers hypothesized that longer delays would result in poorer recall. The number of letters correctly recalled is given in the table.
Delay Before Recall
0 0.5 1
9 9 2
7 10 2
10 4 5
5 6 5
11 5 6
6 2 4
(a) Complete the F-table. (Round your values for MS and F to two decimal places.)
Source of Variation SS df MS F
Between groups
Within groups (error)
Total

(b) Compute Tukey's HSD post hoc test and interpret the results. (Assume alpha equal to 0.05. Round your answer to two decimal places.)
The critical value is for each pairwise comparison.

Which of the comparisons had significant differences? (Select all that apply.)


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

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10. –/3 points PriviteraStats2 16.E.019. My Notes
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A forensic psychologist tests the extent to which the age of a criminal (X) predicts the age of the victim (Y) for nonviolent crimes. The psychologist uses the case files to record the age of five criminals and the age of the victim in those cases. The hypothetical data are listed in the following table.
Age of Criminal Age of Victim
X Y
33 24
24 20
29 25
18 22
13 16
(a) Compute the method of least squares to find the equation of the regression line. (Round your answers to three decimal places.)
Y hat = X +

(b) Use the regression equation to determine the predicted age of a victim of a nonviolent crime when the criminal is 22 years old. (Round your answer to three decimal places.)
years old

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