Formula for calculating the standard score from a sample distribution :
z is the normal score.
μ is the population mean
x is the sample mean
n is the sample size
σ is the population standard deviation
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Ans a) Yes, x is a mean of a sample of n = 400 stocks. By the Central limit theorem, the x distribution is approximately normal.
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Ans b) 0.6228
Explanation:
ans.
/* we can find probability using excel function: =NORM.S.DIST(1.71,TRUE) */
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Ans c) 0.7213
Explanation:
ans.
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Ans d) c) Yes, probability increases as the standard deviation decreases.
Explanation:
Standard score for (b)
Standard score for (c)
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Ans e) 0.0078
The probability of monthly percentage return is close to 0, which suggests it is unlikely to occur, but if it does it will shake up the market.
d) This is very unlikely if μ=1.2%. One would suspect that the European stock market may be heating up.
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