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# Does Duration have an impact on Height? Explain.

INSTRUCTIONS TO CANDIDATES

A1.1

Download the Excel file oldfaith.xlsx Import into JMP and save as oldfaith. jmp

A1.2

from the al folder

(See JMP Notes below)

Explain why Duration shows two distinct "groups" Analyze --> Distribution Select Duration then OK

A1.3

Go back to the JMP dataset and do:

Analyze --> Distribution Select Height then OK

Is there evidence of rounding of the Height data values? Explain

A1.4

Does Duration have an impact on Height? Explain.

Dataset Variables

Time = Time of day (minutes since midnight) at which the eruption actually began, i.e., beginning of time at which water comes out of geyser.

Duration = Length of the previous eruption in minutes.

Interval = Length of time (in minutes) between this eruption and previous eruption.

Preplay = Time of day (minutes since midnight) at which preplay began, where 'preplay' is the time at which the geyser begins a bubbling splash that occurs prior to eruptions.

Height = Estimated height of previous eruption (in feet).

Predict = Time of day (minutes since midnight) at which eruption was predicted to begin. Note: The height of eruption is estimated as follows: A ranger sits in the visitors' center near Old Faithful and observes the eruption. He or she uses a particular tree as a reference marker for the top of the water column (e.g., the water column was just above the third branch). The ranger then estimates the height of the eruption using his mental image of the tree's reference point and a diagram of the tree that has distances marked on it.

JMP Notes

A1.1

3. Start JMP. Select File --> Open...

4. Locate the Excel file oldfaith.xlsx Click Import

5. Save the JMP file created from Import

A1.3

1. On the JMP report: Distributions (for Height)

2. Select Distributions --> Stack (red triangle popup menu)

3. Select the "hand" icon and move the cursor on the graph (changes to the hand icon)

4. Click-and-hold and slide the hand upwards until no further change (bars are now "skinny")

5. Change back to the "arrow" cursor. Hover (do NOT click) over each of the tall bars

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