Reference no: EM133032715
Question - Study and analyze each case. Apply the formula necessary to solve the stated problem.
CASE 1: A random sample of size 70 has a standard deviation of 3.12. Assuming that there is a 92% confidence level, what is the margin of error?
CASE 2: In a sample of 100 cars with a standard deviation of 25km/h speed. Find the margin of error if the level of confidence is 90%.
CASE 3: Mr. V wanted to know the average weight (in kilos) of students in LAO University. He took a random sample of 300 students and discovered that their average weight 55kg with a standard deviation of 0.8kg. Construct a 95% confidence interval for the mean weight of students in the University.
CASE 4: The average price of a 50 cellphones is P13,500 with a sample standard deviation of P750. Find the 98% confidence interval of the true average price of the cellphones.
CASE 5: Compute for the sample size needed if the margin of error is 15, with sample standard deviation of 43 and a 98% level of confidence.
CASE 6: Yeshua wants to have a sample size of the number of children that he needs for his survey project. If he used a 99% confidence interval and a margin of error of 135.8 with a standard deviation of 400, find the sample size he needs.
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