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STAT 200 Final Exam 100% Correct Answers

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STAT 200 Final Exam 100% Correct Answers

1. True or False. Justify for full credit. (25 pts)

(a) The normal distribution curve is always symmetric to its mean.

(b) If the variance from a data set is zero, then all the observations in this data set are identical.

(c) . of complement the is where, 1) AND(AA A APc c

(d) In a hypothesis testing, if the p-value is less than the significance level α, we do not have sufficient evidence to reject the null hypothesis.

(e) The volume of milk in a jug of milk is 128 oz. The value 128 is from a discrete data set.

Refer to the following frequency distribution for Questions 2, 3, 4, and 5. Show all work. Just the answer, without supporting work, will receive no credit.

A random sample of 25 customers was chosen in UMUC MiniMart between 3:00 and 4:00 PM on a Friday afternoon. The frequency distribution below shows the distribution for checkout time (in minutes).

2. Complete the frequency table with frequency and relative frequency.

3. What percentage of the checkout times was less than 3 minutes?

4. In what class interval must the median lie? Explain your answer.

5. Assume that the largest observation in this dataset is 5.8. Suppose this observation were incorrectly recorded as 8.5 instead of 5.8. Will the mean increase, decrease, or remain the same? Will the median increase, decrease or remain the same? Why?

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6. A random sample of STAT200 weekly study times in hours is as follows:

2 15 15 18 30

Find the sample standard deviation. (Round the answer to two decimal places. Show all...

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