City Guilds Model Questions Vol1 2020 Information Technology Question 40
Practice objective / multiple choice question 40 from the 2020 City Guilds Model Questions Vol1 Information Technology examination.
A company recorded the monthly sales (in thousand Naira) for eight months: \(45, 52, 38, 60, 55, 47, 49, 58\). The manager assigned reliability weights to the observations respectively: \(1.2, 0.9, 1.0, 1.5, 1.1, 0.8, 1.0, 1.3\).\n\n(a) Compute the weighted mean of the sales.\n(b) Compute the weighted sample standard deviation using Bessel's correction.\n(c) Assuming the weighted observations are approximately normally distributed, construct a 95 % confidence interval for the true weighted mean.\nGive the weighted mean, the standard deviation and the lower and upper bounds of the confidence interval, each rounded to two decimal places.
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This is City Guilds Model Questions Vol1 2020 Information Technology Question 40. It is one of the objective questions from the 2020 City Guilds Model Questions Vol1 Information Technology examination.
Difficulty level: Hard .
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