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Question: Describing Data: Measures of Central Tendency
Number of Days from order date to arrival in El Paso.
5 10 12 15 20 3 4 5 1 12
9 19 20 24 16 21 20 15 13 9
5 1 2 3 17 21 14 8 6 21
3 6 7 15 19 5 7 9 22 23
12 11 10 14 16 13 14 10 7 4
Using the above data, calculate the following statistics using the frequency distribution table, not the raw data:
Classes
Frequency(f)
midpoint(X)
fX
Cf
a. The midpoint for each class (enter in table above):
b. Calculate the estimated arithmetic mean of the sample
c. Calculate the estimated arithmetic median of the sample
d. The estimated mode of the sample
Under the assumption that co payment amounts are normally distributed, find a 99% confidence interval for the mean amount in dollars.
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If the student IQ score is 90, what is the probability that another student randomly selected has an IQ score of below 90?
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The sample mean and standard deviation are 20 days and 4 days, respectively. Using a confidence interval of 90%, construct the interval.
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