Statistics: Regression Analysis and Hypothesis Testing

STATISTICS
Student ID
[Pick the date]
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Question 1
a) Taking into consideration the nature of questions which are not difficult to understand, the
online survey method seems suitable for collection of data. Besides, conducting a face to face
survey may be difficult when a random sample has been selected because of the underlying
logistics. As a result, an online survey should be put in place and the link shared with the
sample respondents for collection of data (Hillier, 2016).
b) The sutiable sampling method deployed for sample selection would be stratified random
sampling. This has been chosen instead of simple random sampling in order to ensure that the
representation of key attributes matached with the population. These pivotal attributes could
be gender, country of origin besides educational background. These factors can impact the
data to be collected and hence attempt ought to be made to mirror the popualtion in these
regards (Flick, 2015).
c) For the given situation, the preparation time amount would be the independent variable as
with the marks scored as the dependent variable. This may be attributed to the fact that
scoring obtained in exams is a function of the preparation time. Further, both the variables are
numerical while the suitable mesurement scale is ratio as for both the variable, absolute zero
is defined (Eriksson and Kovalainen, 2015).
d) The issues in relation to data collection are highlighted as follows (Medhi, 2016).
 The respondents may be only estimating the preparation time owing to which
accuracy is compromised. Also, the underlying time frame which ought to be used for
computation of preparation time seems to be missing which may lead to subjectivity
in interpretation.
 The reporting of preparation time may be biased by the makrs scored. Students
scoring high marks may have a tendency to overestimate preparation time while those
scoring lower marks could underestimate preparation time.
(e) Frequency distribution with 8 class intervals
 Preparation time
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Based on the above shown histograms, it can be said that distribution of preparation time
follows asymmetric distribution. Also, leftward skew is present (long leftward tail) in the
distribution which shows that data does not follow normal distribution.
 Mark
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