Question

Collect at least 11 observations of quantitative data. Give the source of your data. Construct a dot plot of your data. Compute the mean, median, range, and sample standard deviation. Presentation counts.

Answer 1

data source : The marks in a test on Statistics of 30 student in the college have been recorded.

data:

data 42 37 47 48 46 37 55 59 56 57 46 54 44 52 62 48 33 58 35 53 63 48 75 35 53 64 56 40 42 43

Dotplot-Software used MINITAB17

Steps:Enter the "data"-Graph-dotplot-Simple Y-Ok-Graph variable "data"-ok

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to find range and median at first let us sort the data in increasing order.

33 35 35 37 37 40 42 42 43 44 46 46 47 48 48 48 52 53 53 54 55 56 56 57 58 59 62 63 64 75

Hence, Mnimum=33

Maximum=75

Range=Maximum-minimum=75-33=42

As,n=30=even number,

  

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Now we shall find mean and standard deviation

Let each observation is denoted by x_i, i=1,2,3,4,5,..............................,29,30.

Sample standard deviation

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