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Assume the annual mean return on ABC stock is around 15% and the annual standard deviation is around 25%. Assume the annual and daily returns on ABC stock are normally distributed.
a. What is the probability that ABC will lose money during a year?
b. There is a 5% chance that ABC will earn a return of at least what value during a year?
c. There is a 10% chance that ABC will earn a return of less than or equal to what value during a year?
d. What is the probability that ABC will earn at least 35% during a year?
e. Assume there are 252 trading days in a year. What is the probability that ABC will lose money on a given day? (Hint: Let Y be the annual return on ABC and Xi be the return on ABC on day i. Then [approximately] Y = X1 + X2 +...+ X252.)
The average delivery time is 26.7 with a standard deviation of 8.527. If the customer estimates the time using a 99% confidence interval, what is the margin of error?
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a sample survey interviews an srs of 267 college women. suppose that 70 of all college women have been on a diet within
Some of the factors affect statistical power for a one sample t test. How does statistical power change (increase or decrease) for each of the following changes?
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
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That way you will have evidence to present to the director if you implement the cut in hours. Test the claim that there is no difference at the .01 significance level. Can you implement your staffing changes?
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I run various A/B Split tests online. I always set all my tests for 10,000 visitors so page A and B are each equally rotated 5,000 times.
Consider a follow-up study focusing on the latest calendar year. What sample size is needed to estimate the population proportion of Australian consumers who are trying to save on gas and electricity expenditure to within 2 percentage points with ..
If two of totes don't conform to purity requirements, determine the probability that at least one of nonconforming totes is selected in sample?
identify the types of samples- systematic cluster convenience random stratified1. a sample was taken of every 49th
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