Past Exam for STAT 100 - ELEM STAT & PROB at Maryland (UMD)

Exam Information

 Material Type: Exam 1 Professor: Staff Class: STAT 100 - ELEM STAT & PROB Subject: Statistics and Probability University: University of Maryland Term: Spring 2005 Keywords: Either...orCombinationsThe IndependentCalculatorsExclusive OrExpected ValuesIndependenceApproximationScatter DiagramProbabilities

Sample Document Text

.. Stat 100 ExamlA Spring 2005 Calculators allowed All work must be shown to receive full credit. 1. A sample of6 temperatures in °c were recorded as follows: -2.1, 1.0, -1.4, -3.2, 0.0, -2.3. a) (8 pts) Calculate the mean and median temperatures. b) (8 pts) Calculate the range and standard deviation. c) (4 pts) Make a stem-leaf display. 2. For the following 4 pairs of values: a) (S pts) plot a scatter diagram b) (10 pts) calculate the equation of the regression line and draw it on the scatter diagram indicating 2 points on the line. c) (5 pts) calculate the correlation coefficient and explain what it indicates for this data. x 0 1 6 3 Y 5 4 1 3 3. A box contains four 75-Watt bulbs and six 100-Watt bulbs. Two bulbs are selected at random successively without replacement. Let the events A = a 75-Watt bulb is selected first, and B = a 100-Watt bulb is selected second. a) (5 pts) Find peA). b) (5 pts) Find PCB). c) (S pts) Are A and B independent? JustifY your answer. d) (...

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