assignment 2 pdf STAT 200 common Fin X er. Import your favorites AT 200: Introdu
ID: 3233180 • Letter: A
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assignment 2 pdf STAT 200 common Fin X er. Import your favorites AT 200: Introduction to Statistics Final Examination Spring 2017 OL4 US2 Page 2 of True or False. Justify for full credit. (a) If A and Bare any two events, then POA AND B) S POA OR B). (b) If the variance of a data set is 0, then all the observations in this data set must be zero. (c) The volume of milk in a jug ofmilk is 128 oz. The value 128 is from a discrete data set. (d) When plotted on the same graph, a distribution with a mean of 60 and a standard deviation of 5 will look less spread out than a distribution with a mean of40 and standard deviation of 8. (e) In a left-tailed test, the value of the test statistic is -2. The test statistic follows a distribution with the distribution curve shown below. If we know the shaded area is 0.97, then we do not have sufficient evidence to reject the null hypothesis at 0.05 level of significance.Explanation / Answer
Q1 = 50
Q2, median = 70
Median = 70
Q3 = 82
Q4 = 100
a. IQR = Q3-Q1 = 82-50 = 32
b. If is left skewed, therefore for equal bands lengths ( all of 20 here), the one with lowest frequency will be the one. Here, the lowest frequency appears in the left, as it has left skew. So, i) 30-50 is the answer
c.
25th percentile is 50 score
50th percentile is 70 score .
So, between 50 and 70 scores we have - 80 - 40 = 40 people.
Please note that 50th percentile will contain half of the people (160/2) and 25th will contain 1/4th of people ( 160/4) = 40
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