## Exam Information

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Stat 100
Exam 1 A
Spring 2004
Calculators allowed All work must be showl1to receive full credit.
1. A sample of 6 quiz scores were recorded as follows: 1, 4, 8, 2, 9, 6.
a) (8 pts) Calculate the mean and standard deviatioll.
b) (8 pts) Calculate the median and the range.
c) (4 pts) Make a dot plot of the data.
2. For the following 4 pairs of values:
a) (5 pts) plot a scatter diagram
b) (10 pts) calculate the equation of the regression line and draw it on the scatter diagram
c) (5 pts) without making calculations, estimate the value of the correlation coefficient and
explain what it indicates for this data.
x 0 3 5 8
Y 2 3 5 6
3. An automobile dealership has 50 cars on their lot. Each car has either an automatic or a manual
transmission; furthermore, each car mayor may not have air-conditioning. Use the following data to
solve this exercise: 32 of the cars have air-conditioning, 24 cars have automatic transmission, 17 cars
have air-conditioning and a manual transmissi...

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