Abstract: The primary objective of this study was to determine the influence of family size on students'
academic achievement in business studies in upper basic education in Adamawa State, Nigeria. The
study had two specific objectives from where two research questions were raised and two null
hypotheses were formulated and tested. The design of the study was a mixed of descriptive survey
and ex-post facto design. The population of the study was 69,487 students which were drawn from
upper basic education schools across the five educational zones in Adamawa State, Nigeria. A simple
random sampling technique was used to determine the sample of 382 students for the study. A
structured questionnaire of 15 items was used to collect data and the data collected were analyzed
using means and standard deviation, while the hypotheses were tested using simple linear regression
analysis and Z-test at 0.05 level of significance. The major findings of the study include the
following: family size has a positive significance influence on students' academic achievement in
business studies and there is no difference between males and females students' academic
achievement in business studies in upper basic education in Adamawa State, Nigeria. It was
concluded that family size positively influenced their learning. It was indicated in the findings that
the there is significant positive influence of family size on students' academic achievement in
business studies and there is no difference between males and females students' academic
achievement in business studies in upper basic education in Adamawa State, Nigeria. The
researchers recommended that most of the parents are not fully aware that the larger their family
size, the larger the academic challenges their children may encounter in their academic pursue, it is
therefore recommended that parents should always plan the number of their children for proper
monitoring of all the activities of their ward for effective learning and better academic achievement.
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