Q3 and Q4 Siegel 1990 found that elderly people who owned do

Q3 and Q4: Siegel (1990) found that elderly people who owned dogs were less likely to pay visits to their doctors after upsetting events than were those who did not own pets. Similarly, consider the following hypothetical data. A sample of elderly dog owners is compared to a similar group (in terms of age and health) who do not own dogs. The researcher records the number of visits to the doctor during the past year for each person. The data are as follows:

Q3) Use the dataset above to calculate each of the following statistics. Note that the Control Group is the sample for Population 1 and the Dog Owners Group is the sample for Population 2. (Show all work starting with formula)

a) Xbar₁ and Xbar₂

b) df₁ df₂ df_total

c) ?²₁   ?²₂   ?²pooled (estimated population variances)

d) standard error of the sampling distribution

Q4) (This question is related to Q3) An assisted living facility is reviewing their policy that strictly forbids their elderly residents to have pets, and they will use your data analysis and results to make a decision. Use the statistics calculated in Q3 to determine whether the researcher’s data replicates the findings of the Siegel (1990) study. Perform a hypothesis test using an independent samples t test with an alpha level of .05 and a twotailed design (show all 5 steps of hypothesis testing). As part of your results, make a recommendation to the assisted living facility about their pet policy. (Show all work starting with formula)

Scoring Rubric

Problem 3a:

Deduct as follows:

Incorrect Sample 1 mean (1 point)

Incorrect Sample 2 mean (1 point)

Problem 3b:

Deduct as follows:

Incorrect df₁ (1 point)

Incorrect df₂ (1 point)

Incorrect df_total (1 point)

Problem 3c:

Deduct as follows:

If correct pooled variance equation is not used (2 point)

If correct pooled variance value is not found (1 point)

Problem 3d:

Deduct as follows:

If correct equation is not used (2 point)

If correct value is not found (1 point)

Problem 3e:

Deduct as follows:

If correct equation is not used (1 point)

If correct value is not found (2 point)

Problem 4 (12 points):

1.)State the hypothesis

Deduct as follows:

If any aspect of null hypothesis written in words is incorrect, be sure students are specifically naming the IV and DV (.5 point)

If any aspect of null hypothesis written in notation is incorrect (.5 point)

If any aspect of alternative hypothesis written in words is incorrect, be sure students are specifically naming the IV and DV (.5 point)

If any aspect of alternative hypothesis written in notation is incorrect (.5 point)

2.)Calculate standard error

Deduct as follows:

If correct value is not found per Question 3 (1 point)

3.)Determine critical value

Deduct as follows:

If the critical value is not correct (1 points)

4.)Conduct hypothesis test

Deduct as follows:

If correct t test equation is not used (1 points)

If correct t statistic is not found (1 points)

If t obtained is not correctly compared to t critical in some form – words or notation (1 point)

5.)Make decision about rejecting/failing to reject the hypothesis

Deduct as follows:

If student does not explicitly state “reject the null hypothesis” or “fail to reject the null hypothesis” (1 point)

If student does not write correct conclusion in words (1 points)

If student does not write correct conclusion in notation (1 points)

If student does not correctly advise the assisted living facility (2 points)

Control Group	Pet Owners
10	7
8	4
7	9
9	3
13	7
7	0
6	0
12	0

Solution

Q3)

a)

Calculating the means of each group,          
          
X1 =    9      
X2 =    3.75   [ANSWER, PART A]

************

b)

df1 = n1-1 = 8-1 = 7
df2 = n2-1 = 8-1 = 7   
dftot = df1 + df2 = 7 + 7 = 14 [answer]

************

c)

Calculating the standard deviations of each group,          
          
s1 =    2.507132682      
s2 =    3.615443067      
          
Thus, the pooled standard deviation is given by          
          
S = sqrt[((n1 - 1)s1^2 + (n2 - 1)(s2^2))/(n1 + n2 - 2)]           
          
As n1 =    8   , n2 =    8
          
Then          
          
S =    3.111040249      
          
Thus,

sigma1^2 = 6.285714285
sigma2^2 = 13.07142857
sigmapooled^2 = 9.678571431 [answer]

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d)

Thus, the standard error of the difference is          

Sd = S sqrt (1/n1 + 1/n2) =    1.555520124   [answer]

***************************  
          
e)

As ud = the hypothesized difference between means =    0   , then  
          
tobtained = [X1 - X2 - ud]/Sd =    3.375076875   [answer, tobtained]

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