Given the following data, construct a stem-and leaf diagram. 21 11 12 22 19 45 1

Question

Given the following data, construct a stem-and leaf diagram. 21 11 12 22 19 45 13 21 43 The number of glasses of water consumed by a sample of 10 adults is recorded below. 6 5 0 2 7 1 2 4 5 7 a. Construct a frequency distribution of these ages. b. Construct a histogram Which of the following is not a measure of central tendency? a. Mean b. Median c. Mode d. Standard Deviation The empirical rule applies to which type of distribution? a. Left-skewed b. Bell shaped c. Right-skewed d. Any distribution Given that a distribution is approximately bell-shaped, with a mean of 50 and a standard deviation of 10, between what values would approximately 95% of the observations of the distribution lie? a. 20 and 80 b. 30 and 70 c. 40 and 60 d. none of these

Explanation / Answer

4)

standard deviation is not a measure of central tendency it is a measure of variance

5)

empiral rule states that 68% of data lies within 1 standard deviation, 95% of data lies within 2 standard deviation, 99.7% of data lies within 3 standard deviation

this represents bell curve

6)

lower bound = 50 - 20 = 30

upper bound = 50 + 20 = 70

hence choose b)

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