Statistical Analysis to Support Decision Making - Statistics Assignment Help

Assignement Task :

Question 1 

 The data found in Ass2 Excel file are measurements from cars crashed into a fixed barrier at 35mph with a crash test dummy in the driver’s seat. The variables are:
i. CAR is the different cars that were used in the test.
ii. SIZE is the size of the CAR.
iii. HIC measurement of a standard “head injury criterion”.
a) What type of variable (Continuous, Discrete, Ordinal or Nominal) is i – iii.? Justify your answer.
b)  Using Excel, generate the appropriate graph for the variable HIC.
c) Describe the distribution of the variable HIC.

Question 2

The daily closing price of IBM stock (in $) was found to follow a normal distribution with mean of $85.60 and standard deviation $6.20.
Answer the following questions.
a) What is the probability that on a randomly selected day the stock price closed above $91.80?
b)  What is the probability that on a randomly selected day the stock price closed below $98.00?
c) What is the probability that on a randomly selected day the stock price closed between $73.20 and $98.00?

d) Which would be more unusual, a day on which the stock price closed above $98.00 or below $67.00.

Question 3
A researcher was interested to fine out for large companies in the United States, the percentage of their total income comes from foreign sales.
The researcher compared the percentage of total income from foreign sales with large companies of technology companies (IBM, Hewlett-Packard, Intel, Apple and others) with basic consumer product companies (Goodyear, Sarah Lee, H.J.Heinz and others)
A random sample of technology companies and basic consumer product companies was under-taken.

a)  Identify whether we would need to treat this data as dependent (paired) samples or as two independentsamples. Support your decision.

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