Question
25. A study related to age of people purchasing lottery tickets found that the average age is 50.2 years and standard deviation is 13.40 years,
25. A study related to age of people purchasing lottery tickets found that the average age is 50.2 years and standard deviation is 13.40 years, based on a sample of 40 people. Calculate the margin of error at 95% confidence level.
Select one:
A. 4.153
B. 2.119
C. 3.485
D. 0.657
26. A farmer claims that his oranges weigh at least 250g each. A researcher found that in a random sample of 20 oranges taken from a farm, the sample yields an average weight of 220g with a standard deviation of 15g. A t-distribution used to test the farmer's claim. Calculate the test statistics for this problem.
Select one:
A. 2.25
B. 8.944
C. -8.944
D. 0.2
28. Given IQ scores are approximately normally distributed with a mean of 100 and standard deviation of 15, the proportion of people with IQs above 130 is....
Select one:
A. 95%
B. 2.3%
C. 5%
D. 68%
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