spss1

Question 1. [4 marks] This question relates to the following table extracted from an article by Chang et al. entitled “Association of triglyceride-glucose index with prognosis of COVID-19: A population-based study” published in the Journal of Infection and Public Health (2022). Using the information provided in the table, answer the following questions showing your working and providing answers to two decimal places.
⦁ [1 mark] Of those individuals who reported doing less than 1 day of physical activity per week, what proportion had severe complications of COVID-19?
⦁ [2 marks]
⦁ What percentage of individuals who had never smoked had severe complications of COVID-19?
⦁ What percentage of individuals who had ever smoked (former or current smoker) had severe complications of COVID-19?
⦁ Using this information, does this suggest a relationship between smoking habits and severe complications of COVID-19?
⦁ [1 mark] In a single sentence describe whether you believe the Triglyceride (mg/dL) measures for those participants without severe complications of COVID-19 has a unimodal and symmetric distribution.


Question 2. [11 marks] This question relates to the file diabet.sav. See the document “Description of datasets” on LMS for information on this dataset. Use SPSS (showing your output) and the file diabet.sav to produce requested output and answer the following questions.
⦁ [1 mark] Produce a scatterplot of duration of diabetes in years (DURATION) against glycosylated haemoglobin in mmol/L (HAEM) and comment on the relationship.
⦁ [2 marks] Produce a single table that shows the count and percentage of individuals who died within 5 years (DIED5) by each duration grouping, where the duration grouping is:
DURATION ≤ 5 is short duration
5 < DURATION ≤ 10 is medium duration
DURATION > 10 is long duration.
Describe the relationship between duration group and DIED5. Note, you first need to create the duration grouping variable in SPSS.
⦁ [2 marks] Produce a single table that contains the mean of HEAM and PDW for each level of TREAT. Using this table, describe whether there is any evidence of associations between treatment and either HAEM or PDW.
⦁ [4 marks] Produce side by side box plots showing the distribution of DURATION for each level of TREAT and:
⦁ Describe the distribution of DURATION for each level of TREAT noting any interesting features of these distributions.
⦁ Provide a single sentence that summarises the relationship between DURATION and TREAT.
⦁ In a single sentence provide an explanation of why this relationship could be reasonable.
⦁ [2 marks] Produce a single bar chart that shows the percent with DIED5=1 by TREAT and duration grouping (as created in (b)). Compare the difference in the proportion of individuals who die within 5 years across duration groups, separately for the three different treatments.


Question 3. [3 marks] Consider the following SPSS stem-and-leaf plot for a variable SVAR.
SVAR Stem-and-Leaf Plot
Frequency Stem & Leaf

1.00 7 . 1
.00 7 .
2.00 8 . 12
5.00 8 . 57789
12.00 9 . 001223334444
13.00 9 . 6666677888999
10.00 10 . 0111122333
11.00 10 . 55567788999
11.00 11 . 00001111233
21.00 11 . 555566667777788888999
23.00 12 . 00000011111222223333344
8.00 12 . 56778899
9.00 13 . 011233344
7.00 13 . 5666899
10.00 14 . 0000001224
3.00 14 . 578
4.00 15 . 0011
1.00 15 . 6
1.00 16 . 2

Stem width: 1.00
Each leaf: 1 case(s)

⦁ [2 marks] What is the inter-quartile range of SVAR for this sample of adults? Show working/reasoning.
⦁ [1 mark] What percentage of adults have SVAR greater than 13?

Question 4. [2 marks] Consider the following frequency distribution for the number of ED visits in a two-year period for 59 individuals.
ED_visits
Frequency Percent Valid Percent Cumulative Percent
Valid .00 20 33.9 33.9 33.9
1.00 15 25.4 25.4 59.3
2.00 12 20.3 20.3 79.7
3.00 8 13.6 13.6 93.2
4.00 3 5.1 5.1 98.3
5.00 1 1.7 1.7 100.0
Total 59 100.0 100.0
[2 marks] Use this frequency distribution to obtain the values of the mean and median number of ED visits. Show all working/reasoning.