3. Determining confidence interval estimate (is known). The standard deviation of the masses of 500 blocks is 2.50 kg. Random samples of 50 blocks have a mean mass of 24 kg. Determine a 90% confidence interval for estimating the mean mass of the population.

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3. Determining confidence interval estimate (is known). The standard deviation of the masses of
500 blocks is 2.50 kg. Random samples of 50 blocks have a mean mass of 24 kg. Determine a
90% confidence interval for estimating the mean mass of the population.
4. Arandom sample of 15 students was selected from a population size of 100 (normal) in a certain
dormitory. The mean of weekly expenditures of the sample students is P400 with P17.50
standard deviations. Construct a 95% confidence interval for the average amount of expenditure
of the resident in the dormitory.
Transcribed Image Text:3. Determining confidence interval estimate (is known). The standard deviation of the masses of 500 blocks is 2.50 kg. Random samples of 50 blocks have a mean mass of 24 kg. Determine a 90% confidence interval for estimating the mean mass of the population. 4. Arandom sample of 15 students was selected from a population size of 100 (normal) in a certain dormitory. The mean of weekly expenditures of the sample students is P400 with P17.50 standard deviations. Construct a 95% confidence interval for the average amount of expenditure of the resident in the dormitory.
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