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Maths statistics QUESTION A4 (4 marks) The average monthly household expenses for low-income family are RM1500 with a standard deviation of RM520. A random sample

Maths statistics

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QUESTION A4 (4 marks) The average monthly household expenses for low-income family are RM1500 with a standard deviation of RM520. A random sample of 150 family with low income has been selected in survey. Find the upper limit of 95% confidence interval for the population mean. QUESTION A5 (4 marks) The research was conducted among married postgraduates to know their involvement in continuing their Ph.D. The study aimed to estimate the proportion of 0.02 margins of error with a 90% level of confidence. Determine the sample size that should be selected for this study

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